fix(test): prima parte vuol dire tracciato, non fuori da vendor

Il controllo sui riferimenti esterni scandiva anche i file che git non
conosce. Una copia di comodo di una libreria lasciata in static/js/ --
fabric-debug.js -- sembrava codice nostro e faceva fallire la prova con gli
URL nei propri commenti, ma non sta nel repository e in reparto non ci
arriva mai. Su un checkout pulito la prova passava: falliva solo su chi
aveva quel file, cioe' proprio su chi stava lavorando.

Il filtro ora e' la tracciabilita', non il percorso. Non i pattern di
.gitignore, che non dicono nulla su un file gia' tracciato. Se git non
risponde si scandisce tutto come prima: una prova-guardia che ammutolisce
quando perde l'appoggio e' peggio di una che grida al lupo.

Verificato che morda ancora: un fetch verso un CDN in un file tracciato la
fa fallire.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014BBnuACZSCJqXrMYC3LUMU

.env.example

@@ -30,6 +30,15 @@ STATION_CODE=ST-DEFAULT
 # another station's recipes would silently break traceability.
 STATION_SWITCH_ENABLED=0
 
+# --- Vision ---
+# Internal address of the vision worker. Never exposed outside tmflow-net.
+VISION_WORKER_URL=http://vision:8100
+# The pinned VisionSuite commit, stamped into the vision image at build time
+# (Dockerfile.vision ARG). Required: `docker compose build vision` fails
+# immediately without it. Set with:
+#   VISION_ENGINE_VERSION=$(git -C vendor/visionsuite rev-parse HEAD)
+VISION_ENGINE_VERSION=
+
 # --- File Storage ---
 # Resolved against the project root in src/backend/config.py.
 # Default "uploads" maps to <project_root>/uploads, mounted as a Docker

.gitignore

@@ -77,3 +77,6 @@ nul
 # Competitor analysis (local only)
 Concorrente/
 docker-compose.override.yml
+
+# Subagent-driven development scratch: ledger, briefs, review packages
+.superpowers/

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "vendor/visionsuite"]
+	path = vendor/visionsuite
+	url = ssh://git@git.tielogic.xyz:222/Adriano/visionsuite.git

Dockerfile.vision

@@ -0,0 +1,41 @@
+FROM python:3.13-slim
+
+# opencv-python (pulled in transitively by vs-core/vs-task/vs-measure/vs-pm2d)
+# needs libGL and glib at runtime even though it is never imported by name here.
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        libgl1 libglib2.0-0 \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY --from=ghcr.io/astral-sh/uv:latest /uv /usr/local/bin/uv
+
+WORKDIR /app
+COPY pyproject.toml uv.lock ./
+COPY vendor/ ./vendor/
+RUN uv sync --extra vision-worker --frozen --no-dev
+
+COPY src/vision/ ./src/vision/
+COPY src/vision_worker/ ./src/vision_worker/
+
+# Ruling R8: the version is stamped at build time, not discovered at runtime.
+# COPY vendor/ above does not bring vendor/visionsuite/.git along - it is a
+# gitlink file pointing at ../../.git/modules/vendor/visionsuite, which lives
+# outside the build context - so `git rev-parse HEAD` cannot work in here.
+# Pass the submodule's commit in from the host, which does have git:
+#   VISION_ENGINE_VERSION=$(git -C vendor/visionsuite rev-parse HEAD) \
+#     docker compose build vision
+ARG VISION_ENGINE_VERSION
+# I4: a build without the commit must fail now, at build time - not later, at
+# every request including /health, with a container Docker still reports as
+# healthy because no healthcheck existed to say otherwise.
+RUN test -n "$VISION_ENGINE_VERSION" || { \
+        echo "VISION_ENGINE_VERSION is required. Build with:"; \
+        echo '  VISION_ENGINE_VERSION=$(git -C vendor/visionsuite rev-parse HEAD) docker compose build vision'; \
+        exit 1; \
+    }
+ENV VISION_ENGINE_VERSION=${VISION_ENGINE_VERSION}
+
+EXPOSE 8100
+
+# Two workers, not four: each holds the vision stack in memory.
+CMD ["uv", "run", "uvicorn", "src.vision_worker.main:app", \
+     "--host", "0.0.0.0", "--port", "8100", "--workers", "2"]

README.md

@@ -386,7 +386,89 @@ uv run pytest --cov src/backend
 uv run pytest src/frontend/flask_app/tests/
 ```
 
-Stato corrente su `V3.0.0`: **360 pass, 0 fail** (212 backend + 148 frontend).
+Il modulo di visione (`src/vision/`) è un albero a parte, con un vincolo di
+versione diverso dal resto del monorepo: le librerie di VisionSuite da cui
+dipende richiedono Python 3.13 o superiore, mentre backend e frontend restano
+su Python 3.11. Per questo motivo l'esecuzione di `uv run pytest` con
+l'interprete di default mostra i test di `src/vision/tests/` come *skipped*,
+non come falliti: il pacchetto viene rilevato ma la sua esecuzione reale
+richiede un ambiente Python 3.13 dedicato, creato con il proprio extra `uv`.
+Per eseguirli davvero:
+
+```bash
+# Prepara l'ambiente Python 3.13 con le dipendenze di visione
+uv sync --extra vision --extra dev --python 3.13
+
+# Esegue i test del runner di visione in quell'ambiente
+uv run --python 3.13 --extra vision --extra dev pytest src/vision/tests
+```
+
+`src/vision_worker/tests/` eredita lo stesso vincolo su Python 3.13, perché
+il worker dipende da `src.vision.runner`, ma aggiunge dipendenze proprie -
+FastAPI, Uvicorn, Pillow, python-multipart - dichiarate in un extra
+separato, `vision-worker`, tenuto distinto da `vision` apposta: un
+consumatore che incorpora solo il runner (come un futuro agente di stazione,
+che non è un servizio web) non deve trascinarsi dietro un server che non gli
+serve. `vision-worker` include comunque `vision`, quindi un solo extra basta
+per avere un worker funzionante:
+
+```bash
+uv run --python 3.13 --extra vision-worker --extra dev pytest src/vision_worker/tests
+```
+
+Per eseguire entrambe le suite insieme, nominando esplicitamente entrambi
+gli extra:
+
+```bash
+uv run --python 3.13 --extra vision --extra vision-worker --extra dev pytest src/vision/tests src/vision_worker/tests
+```
+
+### Il worker di visione (`Dockerfile.vision`)
+
+Il worker gira in un container separato dal server FastAPI principale, così
+che l'immagine dell'API resti leggera e un aggiornamento di VisionSuite non
+richieda di riavviare il traffico di produzione. Il container non pubblica
+porte verso l'esterno: lo raggiunge solo il server, all'indirizzo interno
+`http://vision:8100` sulla rete `tmflow-net`.
+
+Ogni misura riporta il commit di VisionSuite che l'ha prodotta
+(`engine_version`), perché una stazione che misura con un motore diverso da
+quello atteso deve poter essere identificata. Il container, però, non ha
+accesso al repository Git del progetto principale — `vendor/visionsuite` è un
+submodule, e la copia `.git` che lo collega al repository ospitante non
+viene inclusa nel contesto di build — quindi la versione non può essere
+scoperta al volo dentro l'immagine. Va invece **stampata al momento del
+build**, leggendo il commit dalla macchina che esegue `docker compose build`,
+dove il repository Git è presente per intero:
+
+```bash
+VISION_ENGINE_VERSION=$(git -C vendor/visionsuite rev-parse HEAD) \
+  docker compose -f docker-compose.dev.yml build vision
+```
+
+La variabile viene passata come build argument (`ARG VISION_ENGINE_VERSION`
+in `Dockerfile.vision`) e fissata nell'immagine come variabile d'ambiente, in
+modo che il worker la trovi già pronta a ogni avvio senza doverla ricalcolare.
+Fuori da un container, in un checkout di sviluppo locale, la stessa funzione
+ricade su `git rev-parse` se la variabile non è impostata — comodo per
+lavorare sul runner senza Docker. Ma se un'immagine viene costruita senza
+passare `VISION_ENGINE_VERSION`, quel ripiego non ha nulla su cui appoggiarsi:
+il `.git` del submodule non arriva nel contesto di build, e il worker
+risponde con un errore esplicito su `/health` invece di indovinare una
+versione o restituire `"unknown"`. La build va quindi sempre lanciata con la
+variabile impostata, sia in sviluppo sia in produzione, con lo stesso comando
+mostrato sopra (sostituendo `docker-compose.dev.yml` con `docker-compose.yml`
+in produzione).
+
+Stato corrente su `V3.0.0`, con `uv run pytest` su Python 3.11 e senza
+l'extra `vision` (un conteggio senza il suo ambiente non dice nulla, regola
+che vale anche qui): **390 pass, 1 fail, 4 skip** — 243 in `src/backend/tests/`,
+147 pass + 2 skip in `src/frontend/flask_app/tests/`, più 2 skip in
+`src/vision/tests/` e `src/vision_worker/tests/` per il vincolo su Python
+3.13 descritto sopra. Il fallimento è preesistente e indipendente da questo
+lavoro: `test_offline.py::test_no_first_party_script_calls_out`, dovuto a una
+copia locale di Fabric.js non tracciata da git (`static/js/fabric-debug.js`)
+che nei propri commenti cita pagine di documentazione esterne.
 
 Alcuni test frontend non renderizzano niente e leggono i sorgenti, perché guardano
 proprietà che sopravvivono solo se qualcuno le controlla:
@@ -413,6 +495,7 @@ Copia `.env.example` in `.env` e configura:
 | `CLIENT_SECRET_KEY` | Chiave segreta Flask (sessioni, CSRF) |
 | `API_SERVER_URL` | URL del backend visto dal client (es. `http://server:8000`) |
 | `STATION_CODE` | **Per-tablet** — codice stazione (es. `ST-001`). Senza, il client mostra errore configurazione. |
+| `VISION_WORKER_URL` | Indirizzo interno del worker di visione (default: `http://vision:8100`, mai esposto fuori da `tmflow-net`) |
 | `UPLOAD_DIR` | Percorso upload file (default: `uploads`, project root) |
 | `MAX_UPLOAD_SIZE_MB` | Limite dimensione upload (default 50) |
 | `RATE_LIMIT_LOGIN` | Login req/min/IP (default 5) |

docker-compose.dev.yml

@@ -33,6 +33,7 @@ services:
     environment:
       DB_HOST: mysql
       UPLOAD_DIR: uploads
+      VISION_WORKER_URL: http://vision:8100
     volumes:
       - upload_data:/app/uploads
     depends_on:
@@ -41,6 +42,23 @@ services:
     networks:
       - tmflow-net
 
+  vision:
+    build:
+      context: .
+      dockerfile: Dockerfile.vision
+      args:
+        VISION_ENGINE_VERSION: ${VISION_ENGINE_VERSION:-}
+    container_name: tmflow-vision
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "python3", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:8100/health', timeout=5)"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 20s
+    networks:
+      - tmflow-net
+
   client:
     build:
       context: .

docker-compose.yml

@@ -33,6 +33,7 @@ services:
     environment:
       DB_HOST: mysql
       UPLOAD_DIR: uploads
+      VISION_WORKER_URL: http://vision:8100
     volumes:
       - upload_data:/app/uploads
     depends_on:
@@ -50,6 +51,23 @@ services:
       - tmflow-net
       - traefik-net
 
+  vision:
+    build:
+      context: .
+      dockerfile: Dockerfile.vision
+      args:
+        VISION_ENGINE_VERSION: ${VISION_ENGINE_VERSION:-}
+    container_name: tmflow-vision
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "python3", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:8100/health', timeout=5)"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 20s
+    networks:
+      - tmflow-net
+
   client:
     build:
       context: .

docs/superpowers/specs/2026-08-16-visionsuite-integration-design.md

@@ -159,6 +159,14 @@ Sblocca tre cose che altrimenti non ci sarebbero:
 Quest'ultima è la rete di sicurezza che rende sostenibile aggiornare il
 sottomodulo, con un motore che sta su due host.
 
+> **Non ancora consegnata.** La colonna `expected_json` esiste, ma nessun
+> percorso la scrive — nemmeno `preview`, che è l'unico posto dove un grafo gira
+> davvero su un'immagine. La prova di non regressione è quindi **promessa da
+> questo documento e non mantenuta da nessuna riga di codice**. Diventa una
+> consegna nominata del piano 1b: «`preview` può promuovere le proprie uscite a
+> `expected_json`». Finché non è fatta, questa decisione non va dichiarata
+> completa.
+
 ## Architettura
 
 ### I componenti
@@ -379,6 +387,73 @@ richiede una camera collegata.
   e i driver possono stare sulla macchina o nel container. La decisione è
   volutamente tardiva; il design la rende tale tenendo l'agente sottile e neutro.
 
+## Correzioni imposte dall'esecuzione
+
+Il piano derivato da questo documento è stato eseguito il 16/08/2026. Sei cose
+che qui erano scritte male o taciute, corrette dai fatti.
+
+### Il gate del fuori tolleranza vale per l'acquisizione, non per la quota
+
+La decisione 7 e il testo del punto 5 parlano di «la quota successiva». Quella
+regola era stata pensata per la misura **manuale e sequenziale**, dove esiste
+davvero un momento successivo in cui l'operatore potrebbe tirare avanti con una
+lettura cattiva irrisolta.
+
+Una camera produce tutte le N quote **nello stesso istante**. Dentro
+un'acquisizione non esiste un «tirare avanti», quindi lì non c'è nulla da
+presidiare — e applicare la regola sequenziale a un evento simultaneo produceva
+un blocco permanente: la lettura fuori tolleranza non veniva mai registrata,
+quindi nessuno poteva autorizzarla, e rifare la stessa foto ripeteva l'errore.
+
+Il gate si valuta **una volta per acquisizione**: se la misura pendente è fra le
+quote che questa acquisizione riprodurrà non blocca — riacquisire *è* rimisurare
+quelle quote, che questo documento già dichiara la via d'uscita che non richiede
+il capoturno. Fra due acquisizioni, e alla chiusura del ciclo, blocca come prima.
+
+### Il repository è deliberatamente bi-ambiente
+
+`vs-task`, `vs-measure` e `vs-pm2d` dichiarano `requires-python >= 3.13`;
+`vs-core` si ferma a 3.10. Backend e frontend restano su **3.11**, l'albero della
+visione gira su **3.13**, e l'extra `vision` porta i marker d'ambiente che
+tengono separate le due risoluzioni.
+
+Questo rafforza la decisione 4 più di come era argomentata: con VisionSuite dentro
+il server FastAPI, questa scoperta avrebbe costretto l'intero backend a 3.13.
+
+### La versione del motore si timbra al build
+
+`vendor/visionsuite/.git` è un file che rimanda a `../../.git/modules/...`, che
+nel contesto di build non esiste: interrogare git dentro il container non
+funziona. `engine_version()` legge `VISION_ENGINE_VERSION` dall'ambiente, ripiega
+su git nei checkout di sviluppo, e **alza un errore** se non risolve né l'uno né
+l'altro. Il build fallisce se la variabile manca.
+
+### La divisione degli extra compra esplicitezza, non peso
+
+Gli extra sono due — `vision` per il runner, `vision-worker` per il servizio web
+— ed è la forma giusta. Ma la motivazione che sembrava ovvia è falsa: `vs-pm2d`
+dichiara **di suo** `fastapi`, `uvicorn`, `python-multipart` e `pillow`, quindi
+un agente di stazione che fa pattern matching se li porterà dietro comunque. La
+correzione vera è a monte — una libreria non dovrebbe dipendere da un server web
+— e va aggiunta alle verifiche su VisionSuite qui sotto.
+
+### L'immagine di produzione non viene ancora conservata
+
+`vision_results.image_path` e `overlay_path` migrano e restano `NULL`: nulla le
+scrive. Il flusso descritto in questo documento si chiude con «il client mostra
+esito e immagine», e finché quelle colonne sono vuote una misura contestata non
+ha prova materiale. Consegna nominata del piano 1b, insieme all'overlay.
+
+### Prima di applicare le migrazioni in produzione
+
+La 011 rinomina un valore di enum su una tabella in esercizio. Va contato prima
+che nessuna riga usi `xf_compare`: in strict mode una riga sopravvissuta fa
+fallire l'`ALTER` a metà deploy, fuori strict mode diventa `''` in silenzio.
+Attenzione anche alla finestra: il `MODIFY` su `recipe_tasks` è una rinomina di
+valore e userà `ALGORITHM=COPY`, mentre quello su `measurements.input_method`
+aggiunge in coda e dovrebbe restare `INPLACE` — da confermare sulle dimensioni
+reali, perché `measurements` è la tabella grossa.
+
 ## Da verificare prima di cominciare
 
 VisionSuite è stato lavorato fino al 15/08/2026 e il suo ultimo commit è

pyproject.toml

@@ -53,6 +53,32 @@ dev = [
     "coverage>=7.0.0",
 ]
 
+# Vision runner (VisionSuite submodule): what src/vision/runner.py needs to
+# execute a graph. vs-task/vs-measure/vs-pm2d require Python >=3.13 upstream;
+# marker keeps the base 3.11 resolution untouched. numpy is declared
+# explicitly - runner.py imports it directly, and it must not depend on
+# being pulled in as a side effect of vs-pm2d's own dependencies.
+vision = [
+    "visionsuite; python_version>='3.13'",
+    "vs-task; python_version>='3.13'",
+    "vs-measure; python_version>='3.13'",
+    "vs-pm2d; python_version>='3.13'",
+    "numpy; python_version>='3.13'",
+]
+
+# Vision worker (src/vision_worker/): the FastAPI shell around the runner,
+# on top of `vision`. Kept separate on purpose (Ruling R9) - VisionSuite's
+# whole structure exists so a consumer installs only what it needs, and a
+# later station agent embeds the same runner without being a web service.
+# It must not drag fastapi/uvicorn onto shop-floor PCs.
+vision-worker = [
+    "tiemeasureflow[vision]",
+    "fastapi>=0.110.0; python_version>='3.13'",
+    "uvicorn[standard]>=0.30.0; python_version>='3.13'",
+    "pillow>=10.0.0; python_version>='3.13'",
+    "python-multipart>=0.0.6; python_version>='3.13'",
+]
+
 [project.scripts]
 # Backend
 server = "uvicorn:run"  # placeholder, real CMD lives in Dockerfile
@@ -70,6 +96,12 @@ packages = ["src/backend", "src/frontend"]
 # Pin the resolver to the deps we declared; reproducible builds.
 package = false
 
+[tool.uv.sources]
+visionsuite = { path = "vendor/visionsuite/packages/vs-core", editable = true }
+vs-task     = { path = "vendor/visionsuite/packages/vs-task", editable = true }
+vs-measure  = { path = "vendor/visionsuite/packages/vs-measure", editable = true }
+vs-pm2d     = { path = "vendor/visionsuite/packages/vs-pm2d", editable = true }
+
 [tool.pytest.ini_options]
 asyncio_mode = "auto"
-testpaths = ["src/backend/tests", "src/frontend/flask_app/tests"]
+testpaths = ["src/backend/tests", "src/frontend/flask_app/tests", "src/vision/tests", "src/vision_worker/tests"]

src/backend/api/routers/tasks.py

@@ -179,6 +179,7 @@ async def create_task(
         file_path=data.file_path,
         file_type=data.file_type,
         annotations_json=data.annotations_json,
+        vision_json=data.vision_json,
     )
     db.add(new_task)
     await db.flush()
@@ -197,6 +198,7 @@ async def create_task(
             ltl=sub_data.ltl,
             unit=sub_data.unit,
             image_path=sub_data.image_path,
+            vision_output=sub_data.vision_output,
         )
         db.add(sub)
 
@@ -340,6 +342,7 @@ async def create_subtask(
         ltl=data.ltl,
         unit=data.unit,
         image_path=data.image_path,
+        vision_output=data.vision_output,
     )
     db.add(subtask)
     await db.flush()

src/backend/api/routers/vision.py

@@ -0,0 +1,133 @@
+"""The client asks for a measurement and gets an outcome.
+
+It does not know, and must not know, whether the server or the station computed
+the numbers: that is what lets a station's configuration change without touching
+the frontend or the recipes.
+"""
+from fastapi import APIRouter, Depends, File, Form, HTTPException, UploadFile, status
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from src.backend.api.middleware.api_key import require_maker, require_measurement_tec
+from src.backend.api.routers.files import ALLOWED_IMAGE_TYPES, validate_file_size
+from src.backend.config import settings
+from src.backend.database import get_db
+from src.backend.models.api.vision import VisionExecuteResponse, VisionMeasurementResult
+from src.backend.models.orm.task import RecipeTask
+from src.backend.models.orm.user import User
+from src.backend.services import vision_service
+
+router = APIRouter(prefix="/api/vision", tags=["vision"])
+
+# A vision graph measures pixels, not a PDF: stricter than files.py's
+# ALLOWED_TYPES, which also accepts documents for technical drawings.
+_IMAGE_EXTENSIONS = {
+    "image/jpeg": "jpg",
+    "image/png": "png",
+    "image/gif": "gif",
+    "image/webp": "webp",
+}
+
+
+async def _task_or_404(db: AsyncSession, task_id: int) -> RecipeTask:
+    """Shared by the endpoints of this router."""
+    task = (await db.execute(
+        select(RecipeTask).where(RecipeTask.id == task_id)
+    )).scalar_one_or_none()
+    if task is None:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND, detail="Task not found"
+        )
+    return task
+
+
+async def _read_image(image: UploadFile) -> bytes:
+    """Type checked from the header before reading, size checked once the body
+    is in hand - the same two-step convention `files.py::upload_file` already
+    uses, reused rather than reinvented here.
+    """
+    if image.content_type not in ALLOWED_IMAGE_TYPES:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=f"File type {image.content_type} not allowed. Must be an image.",
+        )
+    content = await image.read()
+    if not validate_file_size(len(content)):
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=(
+                f"File size {len(content)} bytes exceeds maximum "
+                f"{settings.max_upload_size_mb}MB"
+            ),
+        )
+    return content
+
+
+@router.post("/execute", response_model=VisionExecuteResponse)
+async def execute(
+    task_id: int = Form(...),
+    image: UploadFile = File(...),
+    lot_number: str | None = Form(None),
+    serial_number: str | None = Form(None),
+    production_run_id: int | None = Form(None),
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(require_measurement_tec),
+) -> VisionExecuteResponse:
+    task = await _task_or_404(db, task_id)
+
+    result, saved = await vision_service.execute_task(
+        db,
+        task,
+        await _read_image(image),
+        current_user.id,
+        version_id=task.version_id,
+        lot_number=lot_number,
+        serial_number=serial_number,
+        production_run_id=production_run_id,
+    )
+    await db.commit()
+
+    return VisionExecuteResponse(
+        vision_result_id=result.id,
+        engine_version=result.engine_version,
+        measurements=[
+            VisionMeasurementResult(
+                subtask_id=m.subtask_id, value=float(m.value), pass_fail=m.pass_fail,
+            )
+            for m in saved
+        ],
+    )
+
+
+# Composing a recipe and keeping a reference image are Maker operations, not
+# measuring: both endpoints below gate on `require_maker`, not the
+# `require_measurement_tec` that `execute` above uses.
+
+
+@router.post("/reference-images")
+async def add_reference_image(
+    task_id: int = Form(...),
+    image: UploadFile = File(...),
+    note: str | None = Form(None),
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(require_maker),
+) -> dict:
+    task = await _task_or_404(db, task_id)
+    content = await _read_image(image)
+    reference = await vision_service.save_reference_image(
+        db, task.id, content, note=note,
+        extension=_IMAGE_EXTENSIONS[image.content_type],
+    )
+    await db.commit()
+    return {"id": reference.id, "path": reference.path, "note": reference.note}
+
+
+@router.post("/preview")
+async def preview(
+    task_id: int = Form(...),
+    image: UploadFile = File(...),
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(require_maker),
+) -> dict:
+    task = await _task_or_404(db, task_id)
+    return await vision_service.preview(db, task, await _read_image(image))

src/backend/config.py

@@ -38,6 +38,9 @@ class Settings(BaseSettings):
     openrouter_api_key: str | None = None
     openrouter_model: str = "anthropic/claude-sonnet-4"
 
+    # Vision worker (internal network only, reachable as `vision` in Compose)
+    vision_worker_url: str = "http://vision:8100"
+
     @property
     def database_url(self) -> str:
         """Async MySQL connection string."""

src/backend/main.py

@@ -22,6 +22,7 @@ from src.backend.api.routers.statistics import router as statistics_router
 from src.backend.api.routers.setup import router as setup_router
 from src.backend.api.routers.stations import router as stations_router
 from src.backend.api.routers.production import router as production_router
+from src.backend.api.routers.vision import router as vision_router
 
 
 @asynccontextmanager
@@ -75,6 +76,7 @@ app.include_router(reports_router)
 app.include_router(setup_router)
 app.include_router(stations_router)
 app.include_router(production_router)
+app.include_router(vision_router)
 
 
 @app.get("/api/health")

src/backend/migrations/versions/011_vision_graph.py

@@ -0,0 +1,55 @@
+"""the vision graph lives on the task, and the quote names its output
+
+`xf_compare` was a typo for `dxf_compare`. No row uses either value yet, so
+renaming costs one statement here; from the first saved task onwards it would
+be a data migration and the typo would already be in the public API.
+
+Revision ID: 011_vision_graph
+Revises: 010_meas_authorisation
+Create Date: 2026-08-16
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+revision: str = '011_vision_graph'
+down_revision: Union[str, None] = '010_meas_authorisation'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+OLD_TYPES = ('note', 'measure', 'drawing', 'xf_compare', 'camera_measure')
+NEW_TYPES = ('note', 'measure', 'drawing', 'dxf_compare', 'camera_measure')
+
+
+def upgrade() -> None:
+    with op.batch_alter_table('recipe_tasks') as batch:
+        batch.add_column(sa.Column('vision_json', sa.JSON(), nullable=True))
+        batch.alter_column(
+            'task_type',
+            existing_type=sa.Enum(*OLD_TYPES, name='task_type_enum'),
+            type_=sa.Enum(*NEW_TYPES, name='task_type_enum'),
+            existing_nullable=False,
+            existing_server_default='note',
+        )
+
+    with op.batch_alter_table('recipe_subtasks') as batch:
+        batch.add_column(
+            sa.Column('vision_output', sa.String(length=120), nullable=True)
+        )
+
+
+def downgrade() -> None:
+    with op.batch_alter_table('recipe_subtasks') as batch:
+        batch.drop_column('vision_output')
+
+    with op.batch_alter_table('recipe_tasks') as batch:
+        batch.alter_column(
+            'task_type',
+            existing_type=sa.Enum(*NEW_TYPES, name='task_type_enum'),
+            type_=sa.Enum(*OLD_TYPES, name='task_type_enum'),
+            existing_nullable=False,
+            existing_server_default='note',
+        )
+        batch.drop_column('vision_json')

src/backend/migrations/versions/012_vision_results.py

@@ -0,0 +1,79 @@
+"""one row per vision execution, and camera as an input method
+
+The vision surroundings do not go on `measurements`: statistics and the export
+read that table on every pass. And it would be wrong modelling anyway - one
+acquisition produces N quotes, and image, overlay, device and engine version are
+the same for all of them.
+
+Revision ID: 012_vision_results
+Revises: 011_vision_graph
+Create Date: 2026-08-16
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+revision: str = '012_vision_results'
+down_revision: Union[str, None] = '011_vision_graph'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+OLD_METHODS = ('usb_caliper', 'manual')
+NEW_METHODS = ('usb_caliper', 'manual', 'camera')
+
+
+def upgrade() -> None:
+    op.create_table(
+        'vision_results',
+        sa.Column('id', sa.Integer(), primary_key=True, autoincrement=True),
+        sa.Column('task_id', sa.Integer(),
+                  sa.ForeignKey('recipe_tasks.id'), nullable=False, index=True),
+        sa.Column('image_path', sa.String(length=500), nullable=True),
+        sa.Column('overlay_path', sa.String(length=500), nullable=True),
+        sa.Column('engine_version', sa.String(length=64), nullable=False),
+        sa.Column('executed_on',
+                  sa.Enum('server', 'station', name='vision_executed_on_enum'),
+                  nullable=False),
+        sa.Column('station_id', sa.Integer(),
+                  sa.ForeignKey('stations.id'), nullable=True),
+        sa.Column('device_code', sa.String(length=100), nullable=True),
+        sa.Column('calibration_snapshot', sa.JSON(), nullable=True),
+        sa.Column('graph_snapshot', sa.JSON(), nullable=False),
+        sa.Column('duration_ms', sa.Integer(), nullable=True),
+        sa.Column('executed_at', sa.DateTime(), nullable=False,
+                  server_default=sa.func.now()),
+        mysql_engine='InnoDB',
+        mysql_charset='utf8mb4',
+    )
+
+    with op.batch_alter_table('measurements') as batch:
+        batch.alter_column(
+            'input_method',
+            existing_type=sa.Enum(*OLD_METHODS, name='input_method_enum'),
+            type_=sa.Enum(*NEW_METHODS, name='input_method_enum'),
+            existing_nullable=False,
+        )
+        batch.add_column(
+            sa.Column('vision_result_id', sa.Integer(), nullable=True)
+        )
+        batch.create_foreign_key(
+            'fk_measurements_vision_result',
+            'vision_results', ['vision_result_id'], ['id'],
+        )
+
+
+def downgrade() -> None:
+    with op.batch_alter_table('measurements') as batch:
+        batch.drop_constraint('fk_measurements_vision_result',
+                              type_='foreignkey')
+        batch.drop_column('vision_result_id')
+        batch.alter_column(
+            'input_method',
+            existing_type=sa.Enum(*NEW_METHODS, name='input_method_enum'),
+            type_=sa.Enum(*OLD_METHODS, name='input_method_enum'),
+            existing_nullable=False,
+        )
+
+    op.drop_table('vision_results')

src/backend/migrations/versions/013_reference_images.py

@@ -0,0 +1,49 @@
+"""reference images, with their provenance
+
+A reference image without provenance is a trap: the graph is re-run months later,
+different numbers come out, and there is no way to tell an updated engine from a
+moved lens.
+
+`expected_json` holds what the graph is supposed to produce on this image. It is
+what makes a regression run possible after a VisionSuite upgrade - the safety net
+that makes bumping the submodule sustainable with an engine on two hosts.
+
+Revision ID: 013_reference_images
+Revises: 012_vision_results
+Create Date: 2026-08-16
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+revision: str = '013_reference_images'
+down_revision: Union[str, None] = '012_vision_results'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        'vision_reference_images',
+        sa.Column('id', sa.Integer(), primary_key=True, autoincrement=True),
+        sa.Column('task_id', sa.Integer(),
+                  sa.ForeignKey('recipe_tasks.id'), nullable=False, index=True),
+        sa.Column('path', sa.String(length=500), nullable=False),
+        sa.Column('station_id', sa.Integer(),
+                  sa.ForeignKey('stations.id'), nullable=True),
+        sa.Column('device_code', sa.String(length=100), nullable=True),
+        sa.Column('calibration_snapshot', sa.JSON(), nullable=True),
+        sa.Column('engine_version', sa.String(length=64), nullable=True),
+        sa.Column('note', sa.String(length=500), nullable=True),
+        sa.Column('expected_json', sa.JSON(), nullable=True),
+        sa.Column('acquired_at', sa.DateTime(), nullable=False,
+                  server_default=sa.func.now()),
+        mysql_engine='InnoDB',
+        mysql_charset='utf8mb4',
+    )
+
+
+def downgrade() -> None:
+    op.drop_table('vision_reference_images')

src/backend/models/api/measurement.py

@@ -12,6 +12,11 @@ class MeasurementCreate(BaseModel):
     value: float
     lot_number: Optional[str] = Field(None, max_length=100)
     serial_number: Optional[str] = Field(None, max_length=100)
+    # "camera" is deliberately absent from this pattern, even though the ORM
+    # enum and the database allow it. Do not add it here: a camera
+    # measurement must be produced by vision_service.execute_task, never by a
+    # client posting JSON straight to this endpoint - there is no image, no
+    # graph and no engine_version behind a value that arrived this way.
     input_method: str = Field("manual", pattern="^(usb_caliper|manual)$")
     input_duration_ms: Optional[int] = Field(None, ge=0)
     # The production this belongs to, when one is open at the station.

src/backend/models/api/task.py

@@ -21,6 +21,7 @@ class SubtaskCreate(BaseModel):
     ltl: Optional[float] = None
     unit: str = Field("mm", max_length=20)
     image_path: Optional[str] = Field(None, max_length=500)
+    vision_output: Optional[str] = None
 
 
 class SubtaskUpdate(BaseModel):
@@ -35,6 +36,7 @@ class SubtaskUpdate(BaseModel):
     ltl: Optional[float] = None
     unit: Optional[str] = Field(None, max_length=20)
     image_path: Optional[str] = Field(None, max_length=500)
+    vision_output: Optional[str] = None
 
 
 class SubtaskResponse(BaseModel):
@@ -53,6 +55,7 @@ class SubtaskResponse(BaseModel):
     ltl: Optional[float] = None
     unit: str
     image_path: Optional[str] = None
+    vision_output: Optional[str] = None
 
 
 class TaskCreate(BaseModel):
@@ -64,6 +67,7 @@ class TaskCreate(BaseModel):
     file_path: Optional[str] = Field(None, max_length=500)
     file_type: Optional[str] = Field(None, pattern="^(image|pdf)$")
     annotations_json: Optional[dict[str, Any]] = None
+    vision_json: Optional[dict] = None
     subtasks: list[SubtaskCreate] = []
 
 
@@ -76,6 +80,7 @@ class TaskUpdate(BaseModel):
     file_path: Optional[str] = Field(None, max_length=500)
     file_type: Optional[str] = Field(None, pattern="^(image|pdf)$")
     annotations_json: Optional[dict[str, Any]] = None
+    vision_json: Optional[dict] = None
 
 
 class TaskResponse(BaseModel):
@@ -93,6 +98,7 @@ class TaskResponse(BaseModel):
     file_path: Optional[str] = None
     file_type: Optional[str] = None
     annotations_json: Optional[dict[str, Any]] = None
+    vision_json: Optional[dict] = None
     subtasks: list[SubtaskResponse] = []
 
 

src/backend/models/api/vision.py

@@ -0,0 +1,16 @@
+"""Pydantic schemas for the vision execution response."""
+from pydantic import BaseModel
+
+
+class VisionMeasurementResult(BaseModel):
+    """One quote's outcome, as much of it as the client needs to show."""
+    subtask_id: int
+    value: float
+    pass_fail: str
+
+
+class VisionExecuteResponse(BaseModel):
+    """What `POST /api/vision/execute` returns: the run, and every quote it filled."""
+    vision_result_id: int
+    engine_version: str
+    measurements: list[VisionMeasurementResult]

src/backend/models/orm/__init__.py

@@ -7,6 +7,7 @@ from src.backend.models.orm.access_log import AccessLog
 from src.backend.models.orm.setting import SystemSetting, RecipeVersionAudit
 from src.backend.models.orm.station import Station, StationRecipeAssignment
 from src.backend.models.orm.production import ProductionRun, ProductionEvent
+from src.backend.models.orm.vision import VisionReferenceImage, VisionResult
 
 __all__ = [
     "User",
@@ -22,4 +23,6 @@ __all__ = [
     "StationRecipeAssignment",
     "ProductionRun",
     "ProductionEvent",
+    "VisionResult",
+    "VisionReferenceImage",
 ]

src/backend/models/orm/measurement.py

@@ -38,11 +38,17 @@ class Measurement(Base):
 
     # Input method
     input_method: Mapped[str] = mapped_column(
-        Enum("usb_caliper", "manual", name="input_method_enum"),
+        Enum("usb_caliper", "manual", "camera", name="input_method_enum"),
         nullable=False,
         default="manual",
     )
 
+    # The vision execution that produced this value, when there was one. Null for
+    # everything taken by caliper or typed by hand.
+    vision_result_id: Mapped[Optional[int]] = mapped_column(
+        Integer, ForeignKey("vision_results.id"), nullable=True
+    )
+
     # Time spent by the operator entering this value (client-reported)
     input_duration_ms: Mapped[Optional[int]] = mapped_column(
         Integer, nullable=True

src/backend/models/orm/task.py

@@ -15,7 +15,7 @@ if TYPE_CHECKING:
 # What a task is, declared by whoever writes the recipe instead of guessed from its
 # contents. The last two are not built yet; they are in the enum from the start
 # because widening a MySQL enum later is an ALTER on a live table.
-TASK_TYPES = ("note", "measure", "drawing", "xf_compare", "camera_measure")
+TASK_TYPES = ("note", "measure", "drawing", "dxf_compare", "camera_measure")
 
 # Types the operator screen treats as "there are quotes to take here".
 MEASURING_TASK_TYPES = ("measure", "camera_measure")
@@ -47,6 +47,10 @@ class RecipeTask(Base):
         Enum("image", "pdf", name="file_type_enum"), nullable=True
     )
     annotations_json: Mapped[Optional[dict]] = mapped_column(JSON, nullable=True)
+    # The vision graph, serialised by vs-task. Opaque here on purpose: the
+    # server routes it and never interprets it, which is what keeps VisionSuite
+    # out of this container.
+    vision_json: Mapped[Optional[dict]] = mapped_column(JSON, nullable=True)
 
     # Relationships
     version: Mapped["RecipeVersion"] = relationship(back_populates="tasks")
@@ -89,6 +93,12 @@ class RecipeSubtask(Base):
 
     unit: Mapped[str] = mapped_column(String(20), nullable=False, default="mm")
     image_path: Mapped[Optional[str]] = mapped_column(String(500), nullable=True)
+    # Which output of the vision graph fills this quote: "<tool_id>.<output>".
+    # A link is an id, not a pointer - the same rule vs-task follows, and for
+    # the same reason: a pointer does not survive being written to disk.
+    vision_output: Mapped[Optional[str]] = mapped_column(
+        String(120), nullable=True
+    )
 
     # Relationships
     task: Mapped["RecipeTask"] = relationship(back_populates="subtasks")

src/backend/models/orm/vision.py

@@ -0,0 +1,69 @@
+"""One row per vision execution - not per quote."""
+from datetime import datetime
+from typing import Optional
+
+from sqlalchemy import DateTime, Enum, ForeignKey, Integer, JSON, String, func
+from sqlalchemy.orm import Mapped, mapped_column
+
+from src.backend.database import Base
+
+
+class VisionResult(Base):
+    __tablename__ = "vision_results"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    task_id: Mapped[int] = mapped_column(
+        Integer, ForeignKey("recipe_tasks.id"), nullable=False, index=True
+    )
+    image_path: Mapped[Optional[str]] = mapped_column(String(500), nullable=True)
+    overlay_path: Mapped[Optional[str]] = mapped_column(String(500), nullable=True)
+    engine_version: Mapped[str] = mapped_column(String(64), nullable=False)
+    executed_on: Mapped[str] = mapped_column(
+        Enum("server", "station", name="vision_executed_on_enum"), nullable=False
+    )
+    station_id: Mapped[Optional[int]] = mapped_column(
+        Integer, ForeignKey("stations.id"), nullable=True
+    )
+    device_code: Mapped[Optional[str]] = mapped_column(String(100), nullable=True)
+    # Copied, not referenced: a calibration redone six months from now must not
+    # rewrite what a measurement already taken means. Same for the graph.
+    calibration_snapshot: Mapped[Optional[dict]] = mapped_column(JSON, nullable=True)
+    graph_snapshot: Mapped[dict] = mapped_column(JSON, nullable=False)
+    duration_ms: Mapped[Optional[int]] = mapped_column(Integer, nullable=True)
+    executed_at: Mapped[datetime] = mapped_column(
+        DateTime, nullable=False, server_default=func.now()
+    )
+
+    __table_args__ = ({"mysql_engine": "InnoDB", "mysql_charset": "utf8mb4"},)
+
+    def __repr__(self) -> str:
+        return f"<VisionResult task={self.task_id} engine={self.engine_version}>"
+
+
+class VisionReferenceImage(Base):
+    """An image kept so a graph can be composed, tried and re-tried without a
+    camera - which is exactly what VisionSuite's source abstraction is for."""
+
+    __tablename__ = "vision_reference_images"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    task_id: Mapped[int] = mapped_column(
+        Integer, ForeignKey("recipe_tasks.id"), nullable=False, index=True
+    )
+    path: Mapped[str] = mapped_column(String(500), nullable=False)
+    station_id: Mapped[Optional[int]] = mapped_column(
+        Integer, ForeignKey("stations.id"), nullable=True
+    )
+    device_code: Mapped[Optional[str]] = mapped_column(String(100), nullable=True)
+    calibration_snapshot: Mapped[Optional[dict]] = mapped_column(JSON, nullable=True)
+    engine_version: Mapped[Optional[str]] = mapped_column(String(64), nullable=True)
+    note: Mapped[Optional[str]] = mapped_column(String(500), nullable=True)
+    expected_json: Mapped[Optional[dict]] = mapped_column(JSON, nullable=True)
+    acquired_at: Mapped[datetime] = mapped_column(
+        DateTime, nullable=False, server_default=func.now()
+    )
+
+    __table_args__ = ({"mysql_engine": "InnoDB", "mysql_charset": "utf8mb4"},)
+
+    def __repr__(self) -> str:
+        return f"<VisionReferenceImage task={self.task_id} path={self.path}>"

src/backend/services/measurement_service.py

@@ -224,8 +224,18 @@ async def save_measurement(
     input_method: str = "manual",
     input_duration_ms: int | None = None,
     production_run_id: int | None = None,
+    vision_result_id: int | None = None,
+    enforce_tolerance_gate: bool = True,
 ) -> Measurement:
-    """Save a single measurement with auto-calculated pass/fail."""
+    """Save a single measurement with auto-calculated pass/fail.
+
+    ``enforce_tolerance_gate=False`` skips only the pending-authorisation check
+    below - everything else (verdict, recipe rules, deviation) still applies.
+    This is for a caller that has already evaluated the gate itself for a whole
+    batch of quotes taken at the same instant (see Ruling R10 / vision_service):
+    the gate models "moving on" between measurements taken one after another,
+    which does not exist inside a single camera acquisition.
+    """
     # Get subtask for tolerance values
     result = await db.execute(
         select(RecipeSubtask).where(RecipeSubtask.id == subtask_id)
@@ -240,6 +250,7 @@ async def save_measurement(
     # No moving on while a quote is out of tolerance and unauthorised. Measuring
     # that same quote again is the way out that does not need the capoturno; the
     # next quote is not.
+    if enforce_tolerance_gate:
         blocking = await pending_authorisation(
             db, version_id, measured_by, production_run_id,
         )
@@ -266,6 +277,7 @@ async def save_measurement(
         input_method=input_method,
         input_duration_ms=input_duration_ms,
         production_run_id=production_run_id,
+        vision_result_id=vision_result_id,
     )
     db.add(measurement)
     await db.flush()

src/backend/services/recipe_service.py

@@ -88,6 +88,11 @@ async def _copy_tasks_to_version(
             file_path=task.file_path,
             file_type=task.file_type,
             annotations_json=task.annotations_json,
+            # Carried over explicitly, same reasoning as task_type above: a
+            # copy-on-write version that dropped the camera graph would leave
+            # a camera_measure task unable to execute from the moment a
+            # recipe with measurements is next edited.
+            vision_json=task.vision_json,
         )
         db.add(new_task)
         await db.flush()  # get new_task.id
@@ -105,6 +110,7 @@ async def _copy_tasks_to_version(
                 ltl=sub.ltl,
                 unit=sub.unit,
                 image_path=sub.image_path,
+                vision_output=sub.vision_output,
             )
             db.add(new_sub)
 

src/backend/services/vision_service.py

@@ -0,0 +1,234 @@
+"""Route the image to the worker, map the outputs onto the quotes, save.
+
+This module never imports VisionSuite - see test_vision_boundary.py. It speaks
+to the worker over HTTP and stays ignorant of how a number was produced.
+"""
+from __future__ import annotations
+
+import json
+from pathlib import Path
+from uuid import uuid4
+
+import httpx
+from fastapi import HTTPException, status
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from src.backend.config import settings
+from src.backend.models.orm.measurement import Measurement
+from src.backend.models.orm.task import RecipeSubtask, RecipeTask
+from src.backend.models.orm.vision import VisionReferenceImage, VisionResult
+from src.backend.services import measurement_service
+
+
+async def _call_worker(image_bytes: bytes, graph: dict) -> dict:
+    """The one place that talks to the worker; the tests replace it.
+
+    The worker's fault must not become the API's fault (spec's edge-case
+    table: "il worker isola il guasto, l'API resta in piedi, il task
+    riporta l'errore"). A stopped worker raises `httpx.ConnectError`; a job
+    past the timeout raises `httpx.ReadTimeout` - both would otherwise
+    propagate past this function and surface to the operator as a naked
+    500. The response shape is validated here too: a proxy answering 200
+    with something that is not the worker's JSON contract must not turn
+    into a bare KeyError further down.
+    """
+    try:
+        async with httpx.AsyncClient(timeout=120.0) as client:
+            response = await client.post(
+                f"{settings.vision_worker_url}/run",
+                files={"image": ("frame.png", image_bytes, "image/png")},
+                data={"graph": json.dumps(graph)},
+            )
+    except httpx.ConnectError as exc:
+        raise HTTPException(
+            status_code=status.HTTP_502_BAD_GATEWAY,
+            detail=f"the vision worker is unreachable: {exc}",
+        ) from exc
+    except httpx.ReadTimeout as exc:
+        raise HTTPException(
+            status_code=status.HTTP_504_GATEWAY_TIMEOUT,
+            detail=f"the vision worker did not answer in time: {exc}",
+        ) from exc
+
+    if response.status_code != 200:
+        raise HTTPException(
+            status_code=status.HTTP_502_BAD_GATEWAY,
+            detail=f"the vision worker refused the job: {response.text}",
+        )
+
+    try:
+        report = response.json()
+    except ValueError as exc:
+        raise HTTPException(
+            status_code=status.HTTP_502_BAD_GATEWAY,
+            detail=f"the vision worker's answer was malformed: not valid JSON ({exc})",
+        ) from exc
+
+    if not isinstance(report, dict):
+        raise HTTPException(
+            status_code=status.HTTP_502_BAD_GATEWAY,
+            detail="the vision worker's answer was malformed: expected a JSON object",
+        )
+    missing = {"outputs", "failures", "engine_version"} - report.keys()
+    if missing:
+        raise HTTPException(
+            status_code=status.HTTP_502_BAD_GATEWAY,
+            detail=(
+                "the vision worker's answer was malformed: missing "
+                f"{', '.join(sorted(missing))}"
+            ),
+        )
+    return report
+
+
+async def execute_task(
+    db: AsyncSession,
+    task: RecipeTask,
+    image_bytes: bytes,
+    measured_by: int,
+    *,
+    version_id: int,
+    lot_number: str | None = None,
+    serial_number: str | None = None,
+    production_run_id: int | None = None,
+) -> tuple[VisionResult, list[Measurement]]:
+    if not task.vision_json:
+        raise HTTPException(
+            status_code=status.HTTP_422_UNPROCESSABLE_CONTENT,
+            detail="this task carries no vision graph",
+        )
+
+    # Ordered by marker_number - the number the operator sees on the annotated
+    # image and in reports (RecipeSubtask.__repr__, statistics.py, report_service.py
+    # all key off it). Which quote is saved first must never be an accident of
+    # how SQLite/MySQL happens to return rows.
+    quotes = (await db.execute(
+        select(RecipeSubtask)
+        .where(RecipeSubtask.task_id == task.id)
+        .where(RecipeSubtask.vision_output.is_not(None))
+        .order_by(RecipeSubtask.marker_number)
+    )).scalars().all()
+    if not quotes:
+        raise HTTPException(
+            status_code=status.HTTP_422_UNPROCESSABLE_CONTENT,
+            detail="no quote on this task names a vision output",
+        )
+
+    # Ruling R10: the gate is evaluated once per acquisition, not once per
+    # quote. `save_measurement`'s own gate models "moving on" between
+    # measurements taken one after another - a real later moment where the
+    # operator could leave a bad reading behind. A camera acquisition produces
+    # every quote of this task at the same instant: there is no "moving on"
+    # between them, so applying the sequential rule inside the batch would
+    # block on a fail this very request just saved. Check it once here,
+    # against the whole set this acquisition is about to produce, and pass
+    # enforce_tolerance_gate=False to every save_measurement call below.
+    #
+    # Checked before the worker runs (M3): a blocked operator finds out
+    # without burning a whole vision execution first - the worker is the
+    # expensive part, the gate check is not.
+    blocking = await measurement_service.pending_authorisation(
+        db, version_id, measured_by, production_run_id,
+    )
+    quote_ids = {q.id for q in quotes}
+    if blocking is not None and blocking.subtask_id not in quote_ids:
+        raise HTTPException(
+            status_code=status.HTTP_409_CONFLICT,
+            detail=(
+                "A measurement is out of tolerance and awaiting the supervisor: "
+                "authorise it or measure that quote again before going on"
+            ),
+        )
+
+    report = await _call_worker(image_bytes, task.vision_json)
+    outputs = report["outputs"]
+
+    # Every quote or none. A half-measured piece read as a whole one is worse
+    # than a piece not measured at all.
+    missing = [q.vision_output for q in quotes if q.vision_output not in outputs]
+    if missing:
+        failed = ", ".join(f["tool_name"] for f in report["failures"])
+        raise HTTPException(
+            status_code=status.HTTP_422_UNPROCESSABLE_CONTENT,
+            detail=(
+                f"the graph did not produce {', '.join(missing)}"
+                + (f" (tools that failed: {failed})" if failed else "")
+            ),
+        )
+
+    result = VisionResult(
+        task_id=task.id,
+        engine_version=report["engine_version"],
+        executed_on="server",
+        graph_snapshot=task.vision_json,
+        duration_ms=report.get("duration_ms"),
+    )
+    db.add(result)
+    await db.flush()
+
+    saved: list[Measurement] = []
+    for quote in quotes:
+        saved.append(await measurement_service.save_measurement(
+            db,
+            subtask_id=quote.id,
+            version_id=version_id,
+            measured_by=measured_by,
+            value=float(outputs[quote.vision_output]),
+            lot_number=lot_number,
+            serial_number=serial_number,
+            input_method="camera",
+            production_run_id=production_run_id,
+            vision_result_id=result.id,
+            enforce_tolerance_gate=False,
+        ))
+
+    return result, saved
+
+
+async def save_reference_image(
+    db: AsyncSession,
+    task_id: int,
+    image_bytes: bytes,
+    *,
+    note: str | None = None,
+    station_id: int | None = None,
+    device_code: str | None = None,
+    calibration_snapshot: dict | None = None,
+    extension: str = "png",
+) -> VisionReferenceImage:
+    """Keep an image so the graph can be composed and re-tried without a camera.
+
+    `extension` must match the upload's real content type (the router derives
+    it from `image.content_type`) - writing a jpeg to disk as `<uuid>.png`
+    would be a lie the filename tells forever.
+    """
+    # `upload_path` is the resolved Path, `upload_dir` the bare setting: the
+    # rest of the codebase uses the former (see production_export_service).
+    folder = settings.upload_path / "vision" / "reference" / str(task_id)
+    folder.mkdir(parents=True, exist_ok=True)
+    name = f"{uuid4().hex}.{extension}"
+    (folder / name).write_bytes(image_bytes)
+
+    reference = VisionReferenceImage(
+        task_id=task_id,
+        path=str(Path("vision") / "reference" / str(task_id) / name),
+        note=note,
+        station_id=station_id,
+        device_code=device_code,
+        calibration_snapshot=calibration_snapshot,
+    )
+    db.add(reference)
+    await db.flush()
+    await db.refresh(reference)
+    return reference
+
+
+async def preview(db: AsyncSession, task: RecipeTask, image_bytes: bytes) -> dict:
+    """Run the graph and save nothing. Composing is not measuring."""
+    if not task.vision_json:
+        raise HTTPException(
+            status_code=status.HTTP_422_UNPROCESSABLE_CONTENT,
+            detail="this task carries no vision graph",
+        )
+    return await _call_worker(image_bytes, task.vision_json)

src/backend/tests/test_vision_boundary.py

@@ -0,0 +1,106 @@
+"""Il server non importa VisionSuite, e questo lo verifica.
+
+Senza qualcuno che lo controlli, il confine si perde in silenzio: basta un
+import comodo perché l'immagine dell'API torni da cinque gigabyte e il motivo
+per cui il worker esiste svanisca senza che nessuna prova diventi rossa.
+"""
+import ast
+from pathlib import Path
+
+BACKEND = Path(__file__).resolve().parents[1]
+
+# Full dotted prefixes, not bare roots: "src" alone would forbid every import
+# the backend legitimately makes of itself (src.backend.*), so the entries
+# for the vision tree are multi-segment ("src.vision", "src.vision_worker")
+# while VisionSuite's own top-level packages stay single-segment.
+#
+# M2: "Acquire" used to sit here as a stand-in for vs-camera, but it is a
+# class/SDK name (Balluff's "mvIMPACT Acquire" SDK), never an import root -
+# it could never match. vs-camera imports under the same `visionsuite`
+# namespace as vs-core (see
+# vendor/visionsuite/packages/vs-camera/pyproject.toml: "il codice si importa
+# come visionsuite.camera...."), which "visionsuite" below already forbids,
+# so there is nothing separate to add for it.
+FORBIDDEN = {
+    "visionsuite", "pm2d", "dxf_compare", "torch",
+    "src.vision", "src.vision_worker",
+}
+
+
+def _imported_modules(source: Path) -> set[str]:
+    """Full dotted module paths this file imports - not just their first
+    segment. `from src.vision.runner import ...` must be checked against
+    "src.vision.runner" (inside the forbidden "src.vision"), not against
+    "src" alone, which is never forbidden since the backend imports itself
+    constantly.
+    """
+    tree = ast.parse(source.read_text(encoding="utf-8"), filename=str(source))
+    modules: set[str] = set()
+    for node in ast.walk(tree):
+        if isinstance(node, ast.Import):
+            modules.update(alias.name for alias in node.names)
+        elif isinstance(node, ast.ImportFrom) and node.module and node.level == 0:
+            modules.add(node.module)
+    return modules
+
+
+def _forbidden_hits(modules: set[str]) -> set[str]:
+    """Which FORBIDDEN entries a set of imported module paths triggers.
+
+    A module counts as forbidden if it equals a forbidden entry exactly, or
+    lives inside it ("src.vision.runner" is inside "src.vision").
+    """
+    hits: set[str] = set()
+    for module in modules:
+        for entry in FORBIDDEN:
+            if module == entry or module.startswith(entry + "."):
+                hits.add(entry)
+    return hits
+
+
+def test_the_server_never_imports_visionsuite():
+    offenders = []
+    for source in BACKEND.rglob("*.py"):
+        if "tests" in source.parts or "migrations" in source.parts:
+            continue
+        forbidden = _forbidden_hits(_imported_modules(source))
+        if forbidden:
+            offenders.append(f"{source.relative_to(BACKEND)}: {sorted(forbidden)}")
+
+    assert offenders == [], (
+        "il server deve restare cieco alla visione; usa il worker via HTTP:\n"
+        + "\n".join(offenders)
+    )
+
+
+def test_the_submodule_is_pinned():
+    """Server e stazione devono montare lo stesso commit: qui c'è la fonte."""
+    gitmodules = Path(__file__).resolve().parents[3] / ".gitmodules"
+    assert gitmodules.exists(), "vendor/visionsuite non è un sottomodulo"
+    assert "vendor/visionsuite" in gitmodules.read_text(encoding="utf-8")
+
+
+def test_a_full_module_path_import_is_caught_not_just_its_root(tmp_path):
+    """M2: `from src.vision.runner import ...` inside src/backend/** must be
+    caught. Checking only the first dotted segment ("src") would miss it -
+    "src" itself is never forbidden, the backend imports itself all the time.
+    This is the blind spot the reviewer found: same repository, no install
+    needed, the most tempting shortcut of all.
+    """
+    offender = tmp_path / "sneaky.py"
+    offender.write_text("from src.vision.runner import run_graph\n")
+    assert _forbidden_hits(_imported_modules(offender)) == {"src.vision"}
+
+
+def test_a_vision_worker_import_is_also_caught(tmp_path):
+    offender = tmp_path / "sneaky.py"
+    offender.write_text("import src.vision_worker.main\n")
+    assert _forbidden_hits(_imported_modules(offender)) == {"src.vision_worker"}
+
+
+def test_an_unrelated_src_backend_import_is_not_caught(tmp_path):
+    """The fix must not turn every self-import of the backend into an
+    offender - only the vision subtrees are forbidden."""
+    innocent = tmp_path / "innocent.py"
+    innocent.write_text("from src.backend.config import settings\n")
+    assert _forbidden_hits(_imported_modules(innocent)) == set()

src/backend/tests/test_vision_copy_on_write.py

@@ -0,0 +1,167 @@
+"""C1: the vision graph must survive copy-on-write, and creation must save it.
+
+The spec assumed versioning was free for `vision_json`/`vision_output` - "un
+campo in piu nella copia, non una logica nuova". `_copy_tasks_to_version`
+copies an explicit field list that omitted both fields, so the first edit to
+a recipe that already has measurements silently drops the camera graph from
+the new version. The creation paths (`POST /api/recipes/{id}/tasks` and
+`POST /api/tasks/{id}/subtasks`) have the same shape of bug: `TaskCreate` and
+`SubtaskCreate` declare the fields, but the routers never pass them to the
+ORM constructors, so the API answers 200 and silently does not store them.
+
+Each test file here reads on its own - the same idiom `test_vision_graph.py`
+and `test_recipes.py` already use.
+"""
+import pytest
+from httpx import AsyncClient
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from src.backend.models.orm.measurement import Measurement
+from src.backend.models.orm.recipe import RecipeVersion
+from src.backend.models.orm.task import RecipeSubtask, RecipeTask
+from src.backend.models.orm.user import User
+from src.backend.tests.conftest import auth_headers, create_test_recipe
+
+
+async def _seed_measurement(db: AsyncSession, recipe_id: int, user_id: int) -> None:
+    """Give the current version a measurement, so an update takes the
+    copy-on-write path instead of updating in place."""
+    version_id = (await db.execute(
+        select(RecipeVersion.id).where(
+            RecipeVersion.recipe_id == recipe_id,
+            RecipeVersion.is_current == True,  # noqa: E712
+        )
+    )).scalar_one()
+    subtask_id = (await db.execute(
+        select(RecipeSubtask.id)
+        .join(RecipeSubtask.task)
+        .where(RecipeSubtask.task.has(version_id=version_id))
+    )).scalar_one()
+    db.add(Measurement(
+        subtask_id=subtask_id,
+        version_id=version_id,
+        measured_by=user_id,
+        value=10.0,
+        pass_fail="pass",
+        deviation=0.0,
+        input_method="manual",
+    ))
+    await db.flush()
+
+
+async def _current_task_and_subtask(db: AsyncSession, recipe_id: int):
+    version = (await db.execute(
+        select(RecipeVersion).where(
+            RecipeVersion.recipe_id == recipe_id,
+            RecipeVersion.is_current == True,  # noqa: E712
+        )
+    )).scalar_one()
+    task = (await db.execute(
+        select(RecipeTask).where(RecipeTask.version_id == version.id)
+    )).scalars().first()
+    subtask = (await db.execute(
+        select(RecipeSubtask).where(RecipeSubtask.task_id == task.id)
+    )).scalars().first()
+    return version, task, subtask
+
+
+@pytest.mark.asyncio
+async def test_copy_on_write_preserves_the_vision_graph(
+    client: AsyncClient, db_session: AsyncSession, maker_user: User,
+):
+    """A recipe edit that triggers copy-on-write must not drop the camera graph."""
+    recipe = await create_test_recipe(db_session, maker_user.id)
+    _, task, subtask = await _current_task_and_subtask(db_session, recipe.id)
+    task.task_type = "camera_measure"
+    task.vision_json = {"schema_version": 1, "name": "p", "tools": []}
+    subtask.vision_output = "t1.diameter"
+    await db_session.flush()
+
+    # A measurement on v1 forces the next PUT onto the copy-on-write path.
+    await _seed_measurement(db_session, recipe.id, maker_user.id)
+    db_session.expunge_all()
+
+    resp = await client.put(
+        f"/api/recipes/{recipe.id}",
+        headers=auth_headers(maker_user),
+        json={"change_notes": "Edit that must not drop the graph"},
+    )
+    assert resp.status_code == 200
+    db_session.expunge_all()
+
+    version, new_task, new_subtask = await _current_task_and_subtask(db_session, recipe.id)
+    assert version.version_number == 2, "the edit should have created v2"
+    assert new_task.vision_json == {"schema_version": 1, "name": "p", "tools": []}
+    assert new_subtask.vision_output == "t1.diameter"
+
+
+@pytest.mark.asyncio
+async def test_creating_a_task_persists_its_vision_graph(
+    client: AsyncClient, db_session: AsyncSession, maker_user: User,
+):
+    """POST /api/recipes/{id}/tasks must store vision_json and vision_output,
+    not just accept and echo them back."""
+    recipe = await create_test_recipe(db_session, maker_user.id)
+
+    resp = await client.post(
+        f"/api/recipes/{recipe.id}/tasks",
+        headers=auth_headers(maker_user),
+        json={
+            "title": "Camera task",
+            "task_type": "camera_measure",
+            "vision_json": {"schema_version": 1, "name": "p", "tools": []},
+            "subtasks": [
+                {
+                    "marker_number": 1,
+                    "description": "Diameter",
+                    "nominal": 10.0,
+                    "vision_output": "t1.diameter",
+                }
+            ],
+        },
+    )
+    assert resp.status_code == 201
+    body = resp.json()
+    assert body["vision_json"] == {"schema_version": 1, "name": "p", "tools": []}
+    assert body["subtasks"][0]["vision_output"] == "t1.diameter"
+
+    # Reload from the database - the response reflects the ORM object right
+    # after flush, so this catches a constructor that dropped the field.
+    db_session.expunge_all()
+    task = (await db_session.execute(
+        select(RecipeTask).where(RecipeTask.id == body["id"])
+    )).scalar_one()
+    sub = (await db_session.execute(
+        select(RecipeSubtask).where(RecipeSubtask.task_id == task.id)
+    )).scalars().one()
+    assert task.vision_json == {"schema_version": 1, "name": "p", "tools": []}
+    assert sub.vision_output == "t1.diameter"
+
+
+@pytest.mark.asyncio
+async def test_creating_a_subtask_persists_its_vision_output(
+    client: AsyncClient, db_session: AsyncSession, maker_user: User,
+):
+    """POST /api/tasks/{id}/subtasks (the standalone endpoint) must also store it."""
+    recipe = await create_test_recipe(db_session, maker_user.id)
+    _, task, _ = await _current_task_and_subtask(db_session, recipe.id)
+
+    resp = await client.post(
+        f"/api/tasks/{task.id}/subtasks",
+        headers=auth_headers(maker_user),
+        json={
+            "marker_number": 2,
+            "description": "Radius",
+            "nominal": 5.0,
+            "vision_output": "t1.radius",
+        },
+    )
+    assert resp.status_code == 201
+    assert resp.json()["vision_output"] == "t1.radius"
+
+    db_session.expunge_all()
+    sub = (await db_session.execute(
+        select(RecipeSubtask).where(RecipeSubtask.marker_number == 2)
+    )).scalar_one()
+    assert sub.vision_output == "t1.radius"

src/backend/tests/test_vision_execute.py

@@ -0,0 +1,329 @@
+"""A quote from a camera is a measurement like any other: same verdict, same gate."""
+import io
+
+import pytest
+from PIL import Image
+from sqlalchemy import select
+
+from src.backend.models.orm.measurement import Measurement
+from src.backend.models.orm.recipe import RecipeVersion
+from src.backend.models.orm.task import RecipeSubtask, RecipeTask
+from src.backend.models.orm.vision import VisionResult
+from src.backend.services import measurement_service
+from src.backend.tests.conftest import auth_headers, create_test_recipe
+
+GOOD = 10.0     # inside every limit of the fixture quote
+OUT = 99.0      # far outside
+
+
+def an_image() -> bytes:
+    buffer = io.BytesIO()
+    Image.new("L", (64, 64), color=0).save(buffer, format="PNG")
+    return buffer.getvalue()
+
+
+async def recipe_parts(db_session, recipe_id: int):
+    """`create_test_recipe` returns only the recipe: here it is broken apart."""
+    version = (await db_session.execute(
+        select(RecipeVersion).where(
+            RecipeVersion.recipe_id == recipe_id,
+            RecipeVersion.is_current == True,  # noqa: E712
+        )
+    )).scalar_one()
+    task = (await db_session.execute(
+        select(RecipeTask).where(RecipeTask.version_id == version.id)
+    )).scalars().first()
+    subtask = (await db_session.execute(
+        select(RecipeSubtask).where(RecipeSubtask.task_id == task.id)
+    )).scalars().first()
+    return version, task, subtask
+
+
+async def two_vision_quotes(db_session, recipe_id: int):
+    """The fixture recipe's task, with a second quote mapped to a vision output.
+
+    Same shape as `test_out_of_tolerance.py::_two_quotes`, adapted so both
+    quotes belong to a single camera acquisition instead of two separate
+    manual readings.
+    """
+    version, task, first = await recipe_parts(db_session, recipe_id)
+    first.vision_output = "t1.diameter"
+
+    second = RecipeSubtask(
+        task_id=task.id, marker_number=2, description="Second quote",
+        nominal=10.0, utl=10.5, uwl=10.3, lwl=9.7, ltl=9.5, unit="mm",
+        vision_output="t1.radius",
+    )
+    db_session.add(second)
+    task.task_type = "camera_measure"
+    task.vision_json = {"schema_version": 1, "name": "p", "tools": []}
+    await db_session.commit()
+    await db_session.refresh(second)
+    return version, task, first, second
+
+
+@pytest.fixture
+def worker_says(monkeypatch):
+    """The worker does not run in tests: its response is faked here."""
+    def _install(outputs: dict, failures: list | None = None):
+        async def fake_call(image_bytes: bytes, graph: dict) -> dict:
+            return {
+                "outputs": outputs,
+                "failures": failures or [],
+                "engine_version": "a" * 40,
+                "duration_ms": 12,
+            }
+        monkeypatch.setattr(
+            "src.backend.services.vision_service._call_worker", fake_call,
+        )
+    return _install
+
+
+@pytest.mark.asyncio
+async def test_a_camera_quote_becomes_a_measurement(
+    client, db_session, measurement_tec_user, worker_says,
+):
+    recipe = await create_test_recipe(db_session, measurement_tec_user.id)
+    version, task, subtask = await recipe_parts(db_session, recipe.id)
+    task.task_type = "camera_measure"
+    task.vision_json = {"schema_version": 1, "name": "p", "tools": []}
+    subtask.vision_output = "t1.diameter"
+    # The fixture creates the quote with nominal 10 and tight limits around it.
+    await db_session.commit()
+    worker_says({"t1.diameter": float(subtask.nominal)})
+
+    response = await client.post(
+        "/api/vision/execute",
+        headers=auth_headers(measurement_tec_user),
+        files={"image": ("p.png", an_image(), "image/png")},
+        data={"task_id": str(task.id), "lot_number": "L1"},
+    )
+
+    assert response.status_code == 200
+    saved = (await db_session.execute(
+        select(Measurement).where(Measurement.subtask_id == subtask.id)
+    )).scalars().all()
+    assert len(saved) == 1
+    assert saved[0].pass_fail == "pass"
+    assert saved[0].input_method == "camera"
+    assert saved[0].vision_result_id is not None
+
+
+@pytest.mark.asyncio
+async def test_the_execution_records_which_engine_produced_it(
+    client, db_session, measurement_tec_user, worker_says,
+):
+    recipe = await create_test_recipe(db_session, measurement_tec_user.id)
+    version, task, subtask = await recipe_parts(db_session, recipe.id)
+    task.task_type = "camera_measure"
+    task.vision_json = {"schema_version": 1, "name": "p", "tools": []}
+    subtask.vision_output = "t1.diameter"
+    await db_session.commit()
+    worker_says({"t1.diameter": float(subtask.nominal)})
+
+    await client.post(
+        "/api/vision/execute",
+        headers=auth_headers(measurement_tec_user),
+        files={"image": ("p.png", an_image(), "image/png")},
+        data={"task_id": str(task.id), "lot_number": "L1"},
+    )
+
+    result = (await db_session.execute(select(VisionResult))).scalars().one()
+    assert result.engine_version == "a" * 40
+    assert result.executed_on == "server"
+    assert result.graph_snapshot == task.vision_json
+
+
+@pytest.mark.asyncio
+async def test_a_missing_output_names_itself(
+    client, db_session, measurement_tec_user, worker_says,
+):
+    """No half measurement: if an output is missing, the error names it."""
+    recipe = await create_test_recipe(db_session, measurement_tec_user.id)
+    version, task, subtask = await recipe_parts(db_session, recipe.id)
+    task.task_type = "camera_measure"
+    task.vision_json = {"schema_version": 1, "name": "p", "tools": []}
+    subtask.vision_output = "t1.diameter"
+    await db_session.commit()
+    worker_says({"t1.radius": 5.0})
+
+    response = await client.post(
+        "/api/vision/execute",
+        headers=auth_headers(measurement_tec_user),
+        files={"image": ("p.png", an_image(), "image/png")},
+        data={"task_id": str(task.id), "lot_number": "L1"},
+    )
+
+    assert response.status_code == 422
+    assert "t1.diameter" in response.json()["detail"]
+    assert (await db_session.execute(select(Measurement))).scalars().all() == []
+
+
+@pytest.mark.asyncio
+async def test_a_task_without_a_graph_is_refused(
+    client, db_session, measurement_tec_user, worker_says,
+):
+    recipe = await create_test_recipe(db_session, measurement_tec_user.id)
+    version, task, subtask = await recipe_parts(db_session, recipe.id)
+    task.task_type = "camera_measure"
+    await db_session.commit()
+    worker_says({})
+
+    response = await client.post(
+        "/api/vision/execute",
+        headers=auth_headers(measurement_tec_user),
+        files={"image": ("p.png", an_image(), "image/png")},
+        data={"task_id": str(task.id)},
+    )
+
+    assert response.status_code == 422
+    assert "graph" in response.json()["detail"].lower()
+
+
+# ---------------------------------------------------------------------------
+# Ruling R10: the gate is evaluated once per acquisition, not once per quote.
+# A camera acquisition produces every quote of the task at the same instant -
+# there is no "moving on" between them, so the sequential gate must not fire
+# inside the batch. It still has to fire between two separate acquisitions.
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_a_non_last_out_of_tolerance_quote_does_not_break_the_batch(
+    client, db_session, measurement_tec_user, worker_says,
+):
+    """The quote evaluated first fails; the one after it must still be saved."""
+    recipe = await create_test_recipe(db_session, measurement_tec_user.id)
+    version, task, first, second = await two_vision_quotes(db_session, recipe.id)
+    worker_says({"t1.diameter": OUT, "t1.radius": GOOD})
+
+    response = await client.post(
+        "/api/vision/execute",
+        headers=auth_headers(measurement_tec_user),
+        files={"image": ("p.png", an_image(), "image/png")},
+        data={"task_id": str(task.id)},
+    )
+
+    assert response.status_code == 200
+    by_subtask = {
+        m.subtask_id: m.pass_fail
+        for m in (await db_session.execute(select(Measurement))).scalars().all()
+    }
+    assert by_subtask == {first.id: "fail", second.id: "pass"}
+
+
+@pytest.mark.asyncio
+async def test_a_pending_fail_outside_the_batch_still_blocks(
+    client, db_session, measurement_tec_user, worker_says,
+):
+    """A fail left over from something else this camera task does not cover."""
+    recipe = await create_test_recipe(db_session, measurement_tec_user.id)
+    version, task, first, second = await two_vision_quotes(db_session, recipe.id)
+
+    # A third quote on the same task, not part of this acquisition (no vision
+    # output), already failed and is waiting on a supervisor.
+    third = RecipeSubtask(
+        task_id=task.id, marker_number=3, description="Not a vision quote",
+        nominal=10.0, utl=10.5, uwl=10.3, lwl=9.7, ltl=9.5, unit="mm",
+    )
+    db_session.add(third)
+    await db_session.commit()
+    await db_session.refresh(third)
+    await measurement_service.save_measurement(
+        db_session, subtask_id=third.id, version_id=version.id,
+        measured_by=measurement_tec_user.id, value=OUT,
+    )
+    await db_session.commit()
+
+    worker_says({"t1.diameter": GOOD, "t1.radius": GOOD})
+    response = await client.post(
+        "/api/vision/execute",
+        headers=auth_headers(measurement_tec_user),
+        files={"image": ("p.png", an_image(), "image/png")},
+        data={"task_id": str(task.id)},
+    )
+
+    assert response.status_code == 409
+    assert "supervisor" in response.json()["detail"].lower()
+    assert (await db_session.execute(
+        select(Measurement).where(Measurement.subtask_id.in_([first.id, second.id]))
+    )).scalars().all() == []
+
+
+@pytest.mark.asyncio
+async def test_a_pending_fail_blocks_before_the_worker_is_called(
+    client, db_session, measurement_tec_user, monkeypatch,
+):
+    """M3: a blocked operator must not burn a whole vision execution to learn
+    they are blocked. The gate is checked before the worker runs, not after."""
+    recipe = await create_test_recipe(db_session, measurement_tec_user.id)
+    version, task, first, second = await two_vision_quotes(db_session, recipe.id)
+
+    third = RecipeSubtask(
+        task_id=task.id, marker_number=3, description="Not a vision quote",
+        nominal=10.0, utl=10.5, uwl=10.3, lwl=9.7, ltl=9.5, unit="mm",
+    )
+    db_session.add(third)
+    await db_session.commit()
+    await db_session.refresh(third)
+    await measurement_service.save_measurement(
+        db_session, subtask_id=third.id, version_id=version.id,
+        measured_by=measurement_tec_user.id, value=OUT,
+    )
+    await db_session.commit()
+
+    async def worker_must_not_be_called(image_bytes: bytes, graph: dict) -> dict:
+        raise AssertionError("the worker must not run while the operator is blocked")
+    monkeypatch.setattr(
+        "src.backend.services.vision_service._call_worker", worker_must_not_be_called,
+    )
+
+    response = await client.post(
+        "/api/vision/execute",
+        headers=auth_headers(measurement_tec_user),
+        files={"image": ("p.png", an_image(), "image/png")},
+        data={"task_id": str(task.id)},
+    )
+
+    assert response.status_code == 409
+    assert "supervisor" in response.json()["detail"].lower()
+
+
+@pytest.mark.asyncio
+async def test_a_new_acquisition_can_remeasure_its_own_pending_quote(
+    client, db_session, measurement_tec_user, worker_says,
+):
+    """Re-shooting the same task is the way out, same as re-measuring by hand."""
+    recipe = await create_test_recipe(db_session, measurement_tec_user.id)
+    version, task, first, second = await two_vision_quotes(db_session, recipe.id)
+
+    worker_says({"t1.diameter": OUT, "t1.radius": GOOD})
+    first_shot = await client.post(
+        "/api/vision/execute",
+        headers=auth_headers(measurement_tec_user),
+        files={"image": ("p1.png", an_image(), "image/png")},
+        data={"task_id": str(task.id)},
+    )
+    assert first_shot.status_code == 200
+
+    # first.id is now pending authorisation - but it belongs to this same
+    # task, so a new acquisition of it is not "moving on".
+    worker_says({"t1.diameter": GOOD, "t1.radius": GOOD})
+    second_shot = await client.post(
+        "/api/vision/execute",
+        headers=auth_headers(measurement_tec_user),
+        files={"image": ("p2.png", an_image(), "image/png")},
+        data={"task_id": str(task.id)},
+    )
+    assert second_shot.status_code == 200
+
+    readings = (await db_session.execute(
+        select(Measurement)
+        .where(Measurement.subtask_id == first.id)
+        .order_by(Measurement.id)
+    )).scalars().all()
+    assert [m.pass_fail for m in readings] == ["fail", "pass"]
+
+    assert await measurement_service.pending_authorisation(
+        db_session, version.id, measurement_tec_user.id,
+    ) is None

src/backend/tests/test_vision_graph.py

@@ -0,0 +1,71 @@
+"""Il grafo di visione vive sul task, e la quota sa quale uscita la riempie."""
+import pytest
+from sqlalchemy import select
+
+from src.backend.models.orm.recipe import RecipeVersion
+from src.backend.models.orm.task import TASK_TYPES, RecipeSubtask, RecipeTask
+from src.backend.tests.conftest import create_test_recipe
+
+
+async def recipe_parts(db_session, recipe_id: int):
+    """`create_test_recipe` restituisce la sola ricetta: qui si scompone.
+
+    Versione corrente, il suo unico task, la sua prima quota. È l'idioma che
+    `test_out_of_tolerance.py` usa già, ripetuto perché ogni file di prova si
+    legge da solo.
+    """
+    version = (await db_session.execute(
+        select(RecipeVersion).where(
+            RecipeVersion.recipe_id == recipe_id,
+            RecipeVersion.is_current == True,  # noqa: E712
+        )
+    )).scalar_one()
+    task = (await db_session.execute(
+        select(RecipeTask).where(RecipeTask.version_id == version.id)
+    )).scalars().first()
+    subtask = (await db_session.execute(
+        select(RecipeSubtask).where(RecipeSubtask.task_id == task.id)
+    )).scalars().first()
+    return version, task, subtask
+
+
+@pytest.mark.asyncio
+async def test_task_carries_a_vision_graph(db_session, maker_user):
+    """Il grafo si salva e si rilegge identico: il server non lo interpreta."""
+    recipe = await create_test_recipe(db_session, maker_user.id, code="VIS-1")
+    version, task, subtask = await recipe_parts(db_session, recipe.id)
+    graph = {
+        "schema_version": 1,
+        "name": "diametro del foro",
+        "tools": [{"id": "t1", "kind": "DetectCircle", "name": "foro"}],
+    }
+    task.vision_json = graph
+    task.task_type = "camera_measure"
+    await db_session.flush()
+    db_session.expunge_all()
+
+    reloaded = (await db_session.execute(
+        select(RecipeTask).where(RecipeTask.id == task.id)
+    )).scalar_one()
+    assert reloaded.vision_json == graph
+
+
+@pytest.mark.asyncio
+async def test_subtask_names_the_output_that_fills_it(db_session, maker_user):
+    """La quota dichiara quale uscita del grafo le compete."""
+    recipe = await create_test_recipe(db_session, maker_user.id, code="VIS-2")
+    version, task, subtask = await recipe_parts(db_session, recipe.id)
+    subtask.vision_output = "t1.diameter"
+    await db_session.flush()
+    db_session.expunge_all()
+
+    reloaded = (await db_session.execute(
+        select(RecipeSubtask).where(RecipeSubtask.id == subtask.id)
+    )).scalar_one()
+    assert reloaded.vision_output == "t1.diameter"
+
+
+def test_the_typo_is_gone():
+    """`xf_compare` era un refuso: si corregge finché nessuna riga lo usa."""
+    assert "dxf_compare" in TASK_TYPES
+    assert "xf_compare" not in TASK_TYPES

src/backend/tests/test_vision_reference.py

@@ -0,0 +1,110 @@
+"""The Maker composes at a desk: image saved, graph tried, no measurement."""
+import io
+
+import pytest
+from PIL import Image
+from sqlalchemy import select
+
+from src.backend.config import settings
+from src.backend.models.orm.measurement import Measurement
+from src.backend.models.orm.recipe import RecipeVersion
+from src.backend.models.orm.task import RecipeSubtask, RecipeTask
+from src.backend.models.orm.vision import VisionReferenceImage
+from src.backend.tests.conftest import auth_headers, create_test_recipe
+
+
+def an_image() -> bytes:
+    buffer = io.BytesIO()
+    Image.new("L", (64, 64), color=0).save(buffer, format="PNG")
+    return buffer.getvalue()
+
+
+async def recipe_parts(db_session, recipe_id: int):
+    """`create_test_recipe` returns only the recipe: here it is broken apart."""
+    version = (await db_session.execute(
+        select(RecipeVersion).where(
+            RecipeVersion.recipe_id == recipe_id,
+            RecipeVersion.is_current == True,  # noqa: E712
+        )
+    )).scalar_one()
+    task = (await db_session.execute(
+        select(RecipeTask).where(RecipeTask.version_id == version.id)
+    )).scalars().first()
+    subtask = (await db_session.execute(
+        select(RecipeSubtask).where(RecipeSubtask.task_id == task.id)
+    )).scalars().first()
+    return version, task, subtask
+
+
+@pytest.fixture
+def worker_says(monkeypatch):
+    def _install(outputs: dict):
+        async def fake_call(image_bytes: bytes, graph: dict) -> dict:
+            return {"outputs": outputs, "failures": [],
+                    "engine_version": "b" * 40, "duration_ms": 7}
+        monkeypatch.setattr(
+            "src.backend.services.vision_service._call_worker", fake_call,
+        )
+    return _install
+
+
+@pytest.fixture(autouse=True)
+def redirect_uploads(monkeypatch, tmp_path):
+    """Keep reference images out of the real repo tree during tests.
+
+    `settings.upload_path` is `parents[2] / self.upload_dir`, and pathlib
+    replaces the left operand of `/` when the right one is absolute - so
+    redirecting the bare `upload_dir` setting to pytest's absolute `tmp_path`
+    is enough to redirect the resolved path too.
+    """
+    monkeypatch.setattr(settings, "upload_dir", str(tmp_path))
+
+
+@pytest.mark.asyncio
+async def test_a_reference_image_keeps_its_provenance(
+    client, db_session, maker_user,
+):
+    recipe = await create_test_recipe(db_session, maker_user.id)
+    version, task, subtask = await recipe_parts(db_session, recipe.id)
+    await db_session.commit()
+
+    response = await client.post(
+        "/api/vision/reference-images",
+        headers=auth_headers(maker_user),
+        files={"image": ("ref.png", an_image(), "image/png")},
+        data={"task_id": str(task.id), "note": "sample part"},
+    )
+
+    assert response.status_code == 200
+    saved = (await db_session.execute(
+        select(VisionReferenceImage)
+    )).scalars().one()
+    assert saved.task_id == task.id
+    assert saved.note == "sample part"
+    assert saved.acquired_at is not None
+    assert saved.path
+
+
+@pytest.mark.asyncio
+async def test_preview_runs_the_graph_and_saves_no_measurement(
+    client, db_session, maker_user, worker_says,
+):
+    recipe = await create_test_recipe(db_session, maker_user.id)
+    version, task, subtask = await recipe_parts(db_session, recipe.id)
+    task.task_type = "camera_measure"
+    task.vision_json = {"schema_version": 1, "name": "p", "tools": []}
+    subtask.vision_output = "t1.diameter"
+    await db_session.commit()
+    worker_says({"t1.diameter": 42.0})
+
+    response = await client.post(
+        "/api/vision/preview",
+        headers=auth_headers(maker_user),
+        files={"image": ("ref.png", an_image(), "image/png")},
+        data={"task_id": str(task.id)},
+    )
+
+    assert response.status_code == 200
+    assert response.json()["outputs"]["t1.diameter"] == 42.0
+    # This is the whole point of this test: composing does not measure.
+    assert (await db_session.execute(select(Measurement))).scalars().all() == []

src/backend/tests/test_vision_upload_limits.py

@@ -0,0 +1,190 @@
+"""I3: the three vision endpoints must not accept an unbounded or wrong-typed
+upload. `/execute`, `/preview` and `/reference-images` read the whole image
+into memory with no size cap, and `/reference-images` wrote whatever arrived
+to disk with a `.png` extension regardless of its real type - a PDF is not
+something a vision graph can measure.
+
+Reuses the project's existing convention (`validate_file_size`,
+`ALLOWED_IMAGE_TYPES` from `files.py`) instead of inventing a second one.
+"""
+import io
+
+import pytest
+from PIL import Image
+from sqlalchemy import select
+
+from src.backend.config import settings
+from src.backend.models.orm.measurement import Measurement
+from src.backend.models.orm.recipe import RecipeVersion
+from src.backend.models.orm.task import RecipeSubtask, RecipeTask
+from src.backend.models.orm.vision import VisionReferenceImage, VisionResult
+from src.backend.tests.conftest import auth_headers, create_test_recipe
+
+
+@pytest.fixture(autouse=True)
+def redirect_uploads(monkeypatch, tmp_path):
+    """Keep the reference image this file stores out of the real repo tree.
+
+    The same guard `test_vision_reference.py` carries: without it, the test that
+    proves a jpeg is stored with its own extension leaves a real file under
+    `uploads/vision/reference/`, so every suite run dirties the working tree.
+
+    `settings.upload_path` is `parents[2] / self.upload_dir`, and pathlib
+    replaces the left operand of `/` when the right one is absolute - so
+    redirecting the bare `upload_dir` setting is enough to redirect the
+    resolved path too.
+    """
+    monkeypatch.setattr(settings, "upload_dir", str(tmp_path))
+
+
+def a_png() -> bytes:
+    buffer = io.BytesIO()
+    Image.new("L", (64, 64), color=0).save(buffer, format="PNG")
+    return buffer.getvalue()
+
+
+def a_jpeg() -> bytes:
+    buffer = io.BytesIO()
+    Image.new("RGB", (64, 64), color=0).save(buffer, format="JPEG")
+    return buffer.getvalue()
+
+
+async def recipe_parts(db_session, recipe_id: int):
+    """`create_test_recipe` returns only the recipe: here it is broken apart."""
+    version = (await db_session.execute(
+        select(RecipeVersion).where(
+            RecipeVersion.recipe_id == recipe_id,
+            RecipeVersion.is_current == True,  # noqa: E712
+        )
+    )).scalar_one()
+    task = (await db_session.execute(
+        select(RecipeTask).where(RecipeTask.version_id == version.id)
+    )).scalars().first()
+    subtask = (await db_session.execute(
+        select(RecipeSubtask).where(RecipeSubtask.task_id == task.id)
+    )).scalars().first()
+    return version, task, subtask
+
+
+@pytest.fixture
+def worker_says(monkeypatch):
+    def _install(outputs: dict):
+        async def fake_call(image_bytes: bytes, graph: dict) -> dict:
+            return {"outputs": outputs, "failures": [],
+                    "engine_version": "c" * 40, "duration_ms": 5}
+        monkeypatch.setattr(
+            "src.backend.services.vision_service._call_worker", fake_call,
+        )
+    return _install
+
+
+@pytest.mark.asyncio
+async def test_execute_rejects_a_non_image_upload(
+    client, db_session, measurement_tec_user, worker_says,
+):
+    recipe = await create_test_recipe(db_session, measurement_tec_user.id)
+    version, task, subtask = await recipe_parts(db_session, recipe.id)
+    task.task_type = "camera_measure"
+    task.vision_json = {"schema_version": 1, "name": "p", "tools": []}
+    subtask.vision_output = "t1.diameter"
+    await db_session.commit()
+    worker_says({"t1.diameter": float(subtask.nominal)})
+
+    response = await client.post(
+        "/api/vision/execute",
+        headers=auth_headers(measurement_tec_user),
+        files={"image": ("p.pdf", b"%PDF-1.4 not an image", "application/pdf")},
+        data={"task_id": str(task.id)},
+    )
+
+    assert response.status_code == 400
+    assert (await db_session.execute(select(VisionResult))).scalars().all() == []
+    assert (await db_session.execute(select(Measurement))).scalars().all() == []
+
+
+@pytest.mark.asyncio
+async def test_execute_rejects_an_oversized_upload(
+    client, db_session, measurement_tec_user, worker_says, monkeypatch,
+):
+    recipe = await create_test_recipe(db_session, measurement_tec_user.id)
+    version, task, subtask = await recipe_parts(db_session, recipe.id)
+    task.task_type = "camera_measure"
+    task.vision_json = {"schema_version": 1, "name": "p", "tools": []}
+    subtask.vision_output = "t1.diameter"
+    await db_session.commit()
+    worker_says({"t1.diameter": float(subtask.nominal)})
+    monkeypatch.setattr(settings, "max_upload_size_mb", 0)
+
+    response = await client.post(
+        "/api/vision/execute",
+        headers=auth_headers(measurement_tec_user),
+        files={"image": ("p.png", a_png(), "image/png")},
+        data={"task_id": str(task.id)},
+    )
+
+    assert response.status_code == 400
+    assert (await db_session.execute(select(VisionResult))).scalars().all() == []
+
+
+@pytest.mark.asyncio
+async def test_preview_rejects_a_non_image_upload(
+    client, db_session, maker_user, worker_says,
+):
+    recipe = await create_test_recipe(db_session, maker_user.id)
+    version, task, subtask = await recipe_parts(db_session, recipe.id)
+    task.task_type = "camera_measure"
+    task.vision_json = {"schema_version": 1, "name": "p", "tools": []}
+    await db_session.commit()
+    worker_says({"t1.diameter": 10.0})
+
+    response = await client.post(
+        "/api/vision/preview",
+        headers=auth_headers(maker_user),
+        files={"image": ("p.pdf", b"%PDF-1.4 not an image", "application/pdf")},
+        data={"task_id": str(task.id)},
+    )
+
+    assert response.status_code == 400
+
+
+@pytest.mark.asyncio
+async def test_reference_images_rejects_a_non_image_upload(
+    client, db_session, maker_user,
+):
+    recipe = await create_test_recipe(db_session, maker_user.id)
+    _, task, _ = await recipe_parts(db_session, recipe.id)
+    await db_session.commit()
+
+    response = await client.post(
+        "/api/vision/reference-images",
+        headers=auth_headers(maker_user),
+        files={"image": ("p.pdf", b"%PDF-1.4 not an image", "application/pdf")},
+        data={"task_id": str(task.id)},
+    )
+
+    assert response.status_code == 400
+    assert (await db_session.execute(
+        select(VisionReferenceImage)
+    )).scalars().all() == []
+
+
+@pytest.mark.asyncio
+async def test_reference_image_keeps_the_extension_matching_its_real_type(
+    client, db_session, maker_user,
+):
+    """A jpeg upload must not be written to disk as `<uuid>.png`."""
+    recipe = await create_test_recipe(db_session, maker_user.id)
+    _, task, _ = await recipe_parts(db_session, recipe.id)
+    await db_session.commit()
+
+    response = await client.post(
+        "/api/vision/reference-images",
+        headers=auth_headers(maker_user),
+        files={"image": ("p.jpg", a_jpeg(), "image/jpeg")},
+        data={"task_id": str(task.id)},
+    )
+
+    assert response.status_code == 200
+    saved = (await db_session.execute(select(VisionReferenceImage))).scalars().one()
+    assert saved.path.endswith(".jpg")
+    assert (settings.upload_path / saved.path).exists()

src/backend/tests/test_vision_worker_transport.py

@@ -0,0 +1,117 @@
+"""I2: a broken worker must answer with a named status, never a naked 500.
+
+`_call_worker` mapped a non-200 HTTP response to 502, but let
+`httpx.ConnectError` (worker stopped) and `httpx.ReadTimeout` (job past the
+120s budget) propagate unhandled - with no exception handler in main.py that
+turns those into anything but FastAPI's generic 500. It also read
+`report["outputs"]`, `report["failures"]` and `report["engine_version"]`
+without checking the response had that shape at all, so a proxy answering 200
+with something else (HTML, an empty body) would raise a bare KeyError instead
+of a diagnosable error.
+
+The spec's edge-case table: "il worker isola il guasto, l'API resta in
+piedi, il task riporta l'errore" - the worker's fault must not become the
+API's fault.
+"""
+import httpx
+import pytest
+from fastapi import HTTPException
+
+from src.backend.services.vision_service import _call_worker
+
+
+class _FakeResponse:
+    """Stands in for httpx.Response: only what `_call_worker` touches."""
+
+    def __init__(self, status_code: int, body=..., text: str = "", raise_on_json: bool = False):
+        self.status_code = status_code
+        self._body = body
+        self.text = text
+        self._raise_on_json = raise_on_json
+
+    def json(self):
+        if self._raise_on_json:
+            raise ValueError("not JSON")
+        return self._body
+
+
+class _FakeAsyncClient:
+    """Stands in for httpx.AsyncClient: post() does whatever the test wants."""
+
+    def __init__(self, *, response=None, raises=None):
+        self._response = response
+        self._raises = raises
+
+    async def __aenter__(self):
+        return self
+
+    async def __aexit__(self, *exc_info):
+        return False
+
+    async def post(self, *args, **kwargs):
+        if self._raises is not None:
+            raise self._raises
+        return self._response
+
+
+def _install(monkeypatch, *, response=None, raises=None):
+    monkeypatch.setattr(
+        "src.backend.services.vision_service.httpx.AsyncClient",
+        lambda *a, **k: _FakeAsyncClient(response=response, raises=raises),
+    )
+
+
+@pytest.mark.asyncio
+async def test_a_stopped_worker_answers_502_not_a_naked_500(monkeypatch):
+    _install(monkeypatch, raises=httpx.ConnectError("Connection refused"))
+
+    with pytest.raises(HTTPException) as excinfo:
+        await _call_worker(b"img", {"schema_version": 1, "tools": []})
+
+    assert excinfo.value.status_code == 502
+    assert "unreachable" in excinfo.value.detail.lower()
+
+
+@pytest.mark.asyncio
+async def test_a_job_past_the_time_budget_answers_504(monkeypatch):
+    _install(monkeypatch, raises=httpx.ReadTimeout("timed out"))
+
+    with pytest.raises(HTTPException) as excinfo:
+        await _call_worker(b"img", {"schema_version": 1, "tools": []})
+
+    assert excinfo.value.status_code == 504
+    assert "time" in excinfo.value.detail.lower()
+
+
+@pytest.mark.asyncio
+async def test_a_response_missing_the_expected_keys_is_reported_not_raised_raw(monkeypatch):
+    """A proxy answering 200 with an unexpected shape must not KeyError."""
+    _install(monkeypatch, response=_FakeResponse(200, body={"outputs": {}}))
+
+    with pytest.raises(HTTPException) as excinfo:
+        await _call_worker(b"img", {"schema_version": 1, "tools": []})
+
+    assert excinfo.value.status_code == 502
+    assert "malformed" in excinfo.value.detail.lower()
+
+
+@pytest.mark.asyncio
+async def test_a_response_that_is_not_a_json_object_is_reported(monkeypatch):
+    """200 with HTML or a bare list, say - not a dict at all."""
+    _install(monkeypatch, response=_FakeResponse(200, body=["not", "a", "dict"]))
+
+    with pytest.raises(HTTPException) as excinfo:
+        await _call_worker(b"img", {"schema_version": 1, "tools": []})
+
+    assert excinfo.value.status_code == 502
+    assert "malformed" in excinfo.value.detail.lower()
+
+
+@pytest.mark.asyncio
+async def test_a_well_formed_response_still_passes_through(monkeypatch):
+    body = {"outputs": {"t1.diameter": 10.0}, "failures": [], "engine_version": "a" * 40}
+    _install(monkeypatch, response=_FakeResponse(200, body=body))
+
+    report = await _call_worker(b"img", {"schema_version": 1, "tools": []})
+
+    assert report == body

src/frontend/flask_app/templates/measure/task_list.html

@@ -201,7 +201,7 @@
               'measure': _('Misura'),
               'drawing': _('Disegno'),
               'note': _('Nota'),
-              'xf_compare': _('Confronto profilo'),
+              'dxf_compare': _('Confronto profilo'),
               'camera_measure': _('Misura camera'),
             } %}
             {% set is_measure = task.task_type in ('measure', 'camera_measure') %}

src/frontend/flask_app/tests/test_offline.py

@@ -9,6 +9,7 @@ cdn...">` because it is the quickest way to try something, it works at their des
 and nobody finds out until the machine is on the shop floor.
 """
 import re
+import subprocess
 from pathlib import Path
 
 import pytest
@@ -32,11 +33,42 @@ _DOC_HOSTS = (
 )
 
 
+def _tracked_files():
+    """The files git knows about, or None when git cannot answer.
+
+    Being outside `vendor/` is not the same as being ours. A scratch copy of a
+    library dropped into `static/js/` to debug something looks first-party and is
+    not: it is not in the repository, it never reaches the shop floor, and its
+    comments are not our comments. Trackedness is the honest test for that.
+
+    Trackedness, and not `.gitignore`: an ignore pattern says nothing about a
+    file that is already tracked, so matching patterns would be the wrong
+    question.
+
+    When git cannot answer we scan everything, as before. A guard test that goes
+    quiet the moment it loses its footing is worse than one that cries wolf.
+    """
+    try:
+        listed = subprocess.run(
+            ["git", "ls-files", "-z"],
+            cwd=APP_ROOT, capture_output=True, text=True, check=True,
+        ).stdout
+    except (OSError, subprocess.SubprocessError):
+        return None
+    return {(APP_ROOT / name).resolve() for name in listed.split("\0") if name}
+
+
 def _first_party_files(suffixes):
+    tracked = _tracked_files()
+
+    def is_ours(path):
+        return tracked is None or path.resolve() in tracked
+
     for path in sorted(STATIC.rglob("*")):
-        if path.suffix in suffixes and "vendor" not in path.parts:
+        if path.suffix in suffixes and "vendor" not in path.parts and is_ours(path):
             yield path
     for path in sorted(TEMPLATES.rglob("*.html")):
+        if is_ours(path):
             yield path
 
 

src/vision/runner.py

@@ -0,0 +1,129 @@
+"""Graph plus image in, numbers out.
+
+The one implementation of vision execution: the worker beside the server and
+the station agent both call this, and they must agree to the digit. No HTTP, no
+database, no filesystem beyond reading the pinned submodule's commit.
+"""
+from __future__ import annotations
+
+import os
+import subprocess
+import time
+from dataclasses import dataclass, field
+from functools import lru_cache
+from pathlib import Path
+from typing import Any
+
+import numpy as np
+from visionsuite.core.image import Image
+from visionsuite.task import Task
+
+_SUBMODULE = Path(__file__).resolve().parents[2] / "vendor" / "visionsuite"
+
+
+@dataclass
+class ToolFailure:
+    tool_id: str
+    tool_name: str
+    error: str
+
+
+@dataclass
+class RunOutcome:
+    outputs: dict[str, float] = field(default_factory=dict)
+    failures: list[ToolFailure] = field(default_factory=list)
+    engine_version: str = ""
+    duration_ms: int = 0
+
+
+@lru_cache(maxsize=1)
+def _engine_version_from_git() -> str:
+    """Read the pinned commit from the submodule checkout.
+
+    Cached because the subprocess call is not free and the answer cannot
+    change within a run. Kept separate from `engine_version()` so that the
+    (cheap) environment-variable check below is never served a stale answer,
+    and so a test can force this path to fail without poisoning the cache
+    for real callers.
+    """
+    try:
+        return subprocess.check_output(
+            ["git", "-C", str(_SUBMODULE), "rev-parse", "HEAD"],
+            text=True,
+            stderr=subprocess.PIPE,
+        ).strip()
+    except (OSError, subprocess.CalledProcessError) as exc:
+        raise RuntimeError(
+            "engine_version: cannot determine which VisionSuite commit this "
+            "process is running. VISION_ENGINE_VERSION is not set, and "
+            f"`git -C {_SUBMODULE} rev-parse HEAD` failed ({exc}). "
+            "In the vision worker container this is expected - it has no "
+            "usable .git for the vendored submodule - so the image must be "
+            "built with `--build-arg VISION_ENGINE_VERSION=<commit>` "
+            "(see Dockerfile.vision). In a development checkout, make sure "
+            "the vendor/visionsuite submodule is initialised. Refusing to "
+            "guess: a station must not measure with an engine it cannot name."
+        ) from exc
+
+
+def engine_version() -> str:
+    """The pinned VisionSuite commit: stamped on every number produced.
+
+    Resolution order: the VISION_ENGINE_VERSION environment variable (set at
+    container build time - Ruling R8, see Dockerfile.vision) if set and
+    non-empty; otherwise `git rev-parse HEAD` on the vendored submodule,
+    which works in a development checkout. Never falls back to a guess, an
+    empty string, or "unknown" - a station running an engine it cannot name
+    must refuse to measure rather than produce numbers nobody can trace.
+    """
+    stamped = os.environ.get("VISION_ENGINE_VERSION", "").strip()
+    if stamped:
+        return stamped
+    return _engine_version_from_git()
+
+
+def run_graph(
+    image: Any,
+    graph: dict,
+    calibration: dict | None = None,
+) -> RunOutcome:
+    """Run a serialised vs-task graph against one image.
+
+    A tool that fails does not stop the others - on a crooked piece an edge may
+    simply not be there, and the other quotes are still wanted. Failures come
+    back named, they are not swallowed.
+
+    `image` is whatever the caller already has in hand: a plain numpy array is
+    wrapped into the `visionsuite.core.image.Image` that vs-measure's tools
+    actually read via `.pixels`; an `Image` passed in is used as-is.
+    """
+    task = Task.from_dict(graph)
+    wrapped_image = image if isinstance(image, Image) else Image(pixels=np.asarray(image))
+    context: dict[str, Any] = {"image": wrapped_image}
+    if calibration is not None:
+        context["calibration"] = calibration
+
+    started = time.monotonic()
+    report = task.run(context=context)
+    elapsed_ms = int((time.monotonic() - started) * 1000)
+
+    outputs: dict[str, float] = {}
+    failures: list[ToolFailure] = []
+    for result in report:
+        if not result.ok:
+            failures.append(ToolFailure(
+                tool_id=result.tool_id,
+                tool_name=result.tool_name,
+                error=result.error or "unknown failure",
+            ))
+            continue
+        for name, value in result.outputs.items():
+            if isinstance(value, (int, float)):
+                outputs[f"{result.tool_id}.{name}"] = float(value)
+
+    return RunOutcome(
+        outputs=outputs,
+        failures=failures,
+        engine_version=engine_version(),
+        duration_ms=elapsed_ms,
+    )

src/vision/tests/test_runner.py

@@ -0,0 +1,110 @@
+"""The runner: graph plus image in, numbers out. No HTTP, no database."""
+import pytest
+
+# The vision tree requires Python >=3.13 (vs-task/vs-measure/vs-pm2d declare it
+# upstream, see pyproject.toml's `vision` extra), while backend and frontend
+# stay on 3.11. This must run before `import numpy` - numpy itself is only
+# installed alongside the vision extra - so that `uv run pytest` on the
+# default 3.11 environment reports this module as skipped, with a reason,
+# instead of erroring out of the whole collection.
+pytest.importorskip(
+    "visionsuite.task",
+    reason=(
+        "the vision tree requires Python >=3.13 (vs-task/vs-measure/vs-pm2d "
+        "declare it upstream); run it with "
+        "`uv run --python 3.13 --extra vision --extra dev pytest src/vision/tests`"
+    ),
+)
+
+import numpy as np
+
+from src.vision import runner
+from src.vision.runner import RunOutcome, engine_version, run_graph
+
+
+def a_disc(radius: int = 60, size: int = 400) -> np.ndarray:
+    """A light disc on a dark ground: a fake part, but a measurable one."""
+    image = np.zeros((size, size), dtype=np.uint8)
+    yy, xx = np.ogrid[:size, :size]
+    centre = size // 2
+    image[(yy - centre) ** 2 + (xx - centre) ** 2 <= radius ** 2] = 255
+    return image
+
+
+def a_circle_graph() -> dict:
+    """A two-tool graph, built with vs-task's own API."""
+    from visionsuite.task import Task
+    from visionsuite.task.tools import DetectCircleTool, DiameterTool
+
+    task = Task(name="prova")
+    found = task.add(DetectCircleTool(name="disco"))
+    found.center_row, found.center_col, found.radius = 200.0, 200.0, 60.0
+    found.scan_size = 30.0
+
+    quota = task.add(DiameterTool(name="diametro"))
+    quota.link("circle", found, "circle")
+    return task.to_dict()
+
+
+def test_the_graph_produces_named_outputs():
+    outcome = run_graph(a_disc(), a_circle_graph())
+
+    assert isinstance(outcome, RunOutcome)
+    assert outcome.failures == []
+    # Keys are "tool id dot output name" - the same shape a subtask stores in
+    # vision_output.
+    assert any(key.endswith(".diameter") for key in outcome.outputs)
+    diameter = next(v for k, v in outcome.outputs.items() if k.endswith(".diameter"))
+    assert diameter == pytest.approx(120.0, abs=4.0)
+
+
+def test_a_broken_tool_does_not_sink_the_others():
+    """vs-task does not stop the run on an error: the runner reports it instead."""
+    graph = a_circle_graph()
+    graph["tools"].append(
+        {"id": "ghost", "kind": "DetectCircle", "name": "assente",
+         "properties": {"center_row": 5.0, "center_col": 5.0, "radius": 900.0}}
+    )
+
+    outcome = run_graph(a_disc(), graph)
+
+    assert [f.tool_id for f in outcome.failures] == ["ghost"]
+    assert any(key.endswith(".diameter") for key in outcome.outputs)
+
+
+def test_the_engine_says_which_version_it_is():
+    version = engine_version()
+    assert len(version) == 40  # a full git SHA
+
+
+def test_engine_version_honours_the_environment_variable(monkeypatch):
+    """A build-stamped VISION_ENGINE_VERSION wins over git, if set (Ruling R8:
+    the container has no usable .git for the vendored submodule, so the
+    worker image stamps the commit at build time instead of discovering it)."""
+    stamped = "a" * 40
+    monkeypatch.setenv("VISION_ENGINE_VERSION", stamped)
+    runner._engine_version_from_git.cache_clear()
+
+    try:
+        assert engine_version() == stamped
+    finally:
+        runner._engine_version_from_git.cache_clear()
+
+
+def test_engine_version_raises_rather_than_inventing_one(monkeypatch):
+    """No env var and no resolvable git HEAD: refuse loudly. An engine that
+    cannot say what it is has no business producing measurements - it must
+    never fall back to a guess, an empty string, or "unknown"."""
+    monkeypatch.delenv("VISION_ENGINE_VERSION", raising=False)
+    runner._engine_version_from_git.cache_clear()
+
+    def fake_check_output(*args, **kwargs):
+        raise FileNotFoundError("git: command not found")
+
+    monkeypatch.setattr(runner.subprocess, "check_output", fake_check_output)
+
+    try:
+        with pytest.raises(RuntimeError, match="VISION_ENGINE_VERSION"):
+            engine_version()
+    finally:
+        runner._engine_version_from_git.cache_clear()

src/vision_worker/main.py

@@ -0,0 +1,58 @@
+"""The heavy container: the runner behind an internal API.
+
+Separate from the FastAPI server on purpose. The API image stays light, a
+VisionSuite upgrade does not restart production traffic, and an execution that
+crashes does not take the other tablets' requests down with it.
+"""
+from __future__ import annotations
+
+import json
+
+import numpy as np
+from fastapi import FastAPI, File, Form, HTTPException, UploadFile, status
+from PIL import Image
+
+from src.vision.runner import engine_version, run_graph
+
+app = FastAPI(title="TieMeasureFlow Vision Worker", version="0.1.0")
+
+
+@app.get("/health")
+async def health() -> dict:
+    return {"status": "ok", "engine_version": engine_version()}
+
+
+@app.post("/run")
+async def run(
+    image: UploadFile = File(...),
+    graph: str = Form(...),
+) -> dict:
+    try:
+        parsed_graph = json.loads(graph)
+    except json.JSONDecodeError as exc:
+        raise HTTPException(
+            status_code=status.HTTP_422_UNPROCESSABLE_CONTENT,
+            detail=f"graph is not valid JSON: {exc}",
+        ) from exc
+
+    frame = np.array(Image.open(image.file).convert("L"))
+
+    try:
+        outcome = run_graph(frame, parsed_graph)
+    except ValueError as exc:
+        # from_dict refuses a schema version it does not handle; that is a bad
+        # request, not a server fault.
+        raise HTTPException(
+            status_code=status.HTTP_422_UNPROCESSABLE_CONTENT,
+            detail=str(exc),
+        ) from exc
+
+    return {
+        "outputs": outcome.outputs,
+        "failures": [
+            {"tool_id": f.tool_id, "tool_name": f.tool_name, "error": f.error}
+            for f in outcome.failures
+        ],
+        "engine_version": outcome.engine_version,
+        "duration_ms": outcome.duration_ms,
+    }

src/vision_worker/tests/test_worker.py

@@ -0,0 +1,97 @@
+"""The worker is a thin shell: it receives an image and a graph, and answers
+with numbers."""
+import io
+import json
+
+import pytest
+
+# Same reasoning as src/vision/tests/test_runner.py: the vision tree (and
+# therefore this worker, which imports src.vision.runner) requires Python
+# >=3.13. This must run before `import numpy` / `from src.vision_worker.main
+# import app` so that `uv run pytest` on the default 3.11 environment reports
+# this module as skipped, with a reason, instead of erroring out of
+# collection.
+pytest.importorskip(
+    "visionsuite.task",
+    reason=(
+        "the vision tree requires Python >=3.13 (vs-task/vs-measure/vs-pm2d "
+        "declare it upstream); run it with "
+        "`uv run --python 3.13 --extra vision-worker --extra dev pytest "
+        "src/vision_worker/tests`"
+    ),
+)
+
+import numpy as np
+from httpx import ASGITransport, AsyncClient
+from PIL import Image
+
+from src.vision_worker.main import app
+
+
+def a_disc_png(radius: int = 60, size: int = 400) -> bytes:
+    image = np.zeros((size, size), dtype=np.uint8)
+    yy, xx = np.ogrid[:size, :size]
+    centre = size // 2
+    image[(yy - centre) ** 2 + (xx - centre) ** 2 <= radius ** 2] = 255
+    buffer = io.BytesIO()
+    Image.fromarray(image).save(buffer, format="PNG")
+    return buffer.getvalue()
+
+
+def a_circle_graph() -> dict:
+    from visionsuite.task import Task
+    from visionsuite.task.tools import DetectCircleTool, DiameterTool
+
+    task = Task(name="prova")
+    found = task.add(DetectCircleTool(name="disco"))
+    found.center_row, found.center_col, found.radius = 200.0, 200.0, 60.0
+    found.scan_size = 30.0
+    quota = task.add(DiameterTool(name="diametro"))
+    quota.link("circle", found, "circle")
+    return task.to_dict()
+
+
+@pytest.mark.asyncio
+async def test_health_says_which_engine_it_carries():
+    transport = ASGITransport(app=app)
+    async with AsyncClient(transport=transport, base_url="http://worker") as client:
+        response = await client.get("/health")
+
+    assert response.status_code == 200
+    assert len(response.json()["engine_version"]) == 40
+
+
+@pytest.mark.asyncio
+async def test_run_returns_the_named_outputs():
+    transport = ASGITransport(app=app)
+    async with AsyncClient(transport=transport, base_url="http://worker") as client:
+        response = await client.post(
+            "/run",
+            files={"image": ("piece.png", a_disc_png(), "image/png")},
+            data={"graph": json.dumps(a_circle_graph())},
+        )
+
+    assert response.status_code == 200
+    body = response.json()
+    assert body["failures"] == []
+    assert any(key.endswith(".diameter") for key in body["outputs"])
+    # Pinned to src/vision/tests/test_runner.py's in-process expectation
+    # (same graph, same image, same tolerance) - the whole point of a shared
+    # engine_version is that the number does not depend on which path
+    # computed it.
+    diameter = next(v for k, v in body["outputs"].items() if k.endswith(".diameter"))
+    assert diameter == pytest.approx(120.0, abs=4.0)
+
+
+@pytest.mark.asyncio
+async def test_a_malformed_graph_is_refused_not_crashed():
+    transport = ASGITransport(app=app)
+    async with AsyncClient(transport=transport, base_url="http://worker") as client:
+        response = await client.post(
+            "/run",
+            files={"image": ("piece.png", a_disc_png(), "image/png")},
+            data={"graph": json.dumps({"schema_version": 99, "tools": []})},
+        )
+
+    assert response.status_code == 422
+    assert "99" in response.json()["detail"]

uv.lock

@@ -941,6 +941,35 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/4b/97/f6de8d4af54d6401d6581a686cce3e3e2371a79ba459a449104e026c08bc/kaleido-1.2.0-py3-none-any.whl", hash = "sha256:c27ed82b51df6b923d0e656feac221343a0dbcd2fb9bc7e6b1db97f61e9a1513", size = 68997, upload-time = "2025-11-04T21:24:21.704Z" },
 ]
 
+[[package]]
+name = "llvmlite"
+version = "0.49.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/43/27/72ae94ea5c8f7349ec1c229d4cd058feb799cbd0833ad6d1b47c919b37b7/llvmlite-0.49.0.tar.gz", hash = "sha256:00f16db782f4a13c78c5804aedc434e46794a77e89999a168f9401106270e50a", size = 194467, upload-time = "2026-08-11T16:26:00.489Z" }
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@@ -1769,6 +1974,24 @@ server = [
     { name = "uvicorn", extra = ["standard"] },
     { name = "weasyprint" },
 ]
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+    { name = "numpy", marker = "python_full_version >= '3.13'" },
+    { name = "visionsuite", marker = "python_full_version >= '3.13'" },
+    { name = "vs-measure", marker = "python_full_version >= '3.13'" },
+    { name = "vs-pm2d", marker = "python_full_version >= '3.13'" },
+    { name = "vs-task", marker = "python_full_version >= '3.13'" },
+]
+vision-worker = [
+    { name = "fastapi", marker = "python_full_version >= '3.13'" },
+    { name = "numpy", marker = "python_full_version >= '3.13'" },
+    { name = "pillow", marker = "python_full_version >= '3.13'" },
+    { name = "python-multipart", marker = "python_full_version >= '3.13'" },
+    { name = "uvicorn", extra = ["standard"], marker = "python_full_version >= '3.13'" },
+    { name = "visionsuite", marker = "python_full_version >= '3.13'" },
+    { name = "vs-measure", marker = "python_full_version >= '3.13'" },
+    { name = "vs-pm2d", marker = "python_full_version >= '3.13'" },
+    { name = "vs-task", marker = "python_full_version >= '3.13'" },
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 [package.metadata]
 requires-dist = [
@@ -1777,6 +2000,7 @@ requires-dist = [
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     { name = "bcrypt", marker = "extra == 'server'", specifier = ">=4.0.0" },
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+    { name = "fastapi", marker = "python_full_version >= '3.13' and extra == 'vision-worker'", specifier = ">=0.110.0" },
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     { name = "kaleido", marker = "extra == 'server'", specifier = ">=0.2.0" },
+    { name = "numpy", marker = "python_full_version >= '3.13' and extra == 'vision'" },
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+    { name = "pillow", marker = "python_full_version >= '3.13' and extra == 'vision-worker'", specifier = ">=10.0.0" },
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@@ -1794,14 +2020,21 @@ requires-dist = [
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     { name = "pytest-asyncio", marker = "extra == 'dev'", specifier = ">=0.23.0" },
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+    { name = "python-multipart", marker = "python_full_version >= '3.13' and extra == 'vision-worker'", specifier = ">=0.0.6" },
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     { name = "sqlalchemy", extras = ["asyncio"], marker = "extra == 'server'", specifier = ">=2.0.0" },
+    { name = "tiemeasureflow", extras = ["vision"], marker = "extra == 'vision-worker'" },
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+    { name = "uvicorn", extras = ["standard"], marker = "python_full_version >= '3.13' and extra == 'vision-worker'", specifier = ">=0.30.0" },
     { name = "uvicorn", extras = ["standard"], marker = "extra == 'server'", specifier = ">=0.30.0" },
+    { name = "visionsuite", marker = "python_full_version >= '3.13' and extra == 'vision'", editable = "vendor/visionsuite/packages/vs-core" },
+    { name = "vs-measure", marker = "python_full_version >= '3.13' and extra == 'vision'", editable = "vendor/visionsuite/packages/vs-measure" },
+    { name = "vs-pm2d", marker = "python_full_version >= '3.13' and extra == 'vision'", editable = "vendor/visionsuite/packages/vs-pm2d" },
+    { name = "vs-task", marker = "python_full_version >= '3.13' and extra == 'vision'", editable = "vendor/visionsuite/packages/vs-task" },
     { name = "weasyprint", marker = "extra == 'server'", specifier = ">=62.0" },
 ]
-provides-extras = ["server", "client", "dev"]
+provides-extras = ["server", "client", "dev", "vision", "vision-worker"]
 
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 ]
 
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+    { name = "opencv-python", marker = "python_full_version >= '3.13'" },
+]
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+[package.metadata]
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+    { name = "numpy", specifier = ">=1.24" },
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+    { name = "pytest", marker = "extra == 'dev'", specifier = ">=7" },
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+provides-extras = ["dev", "fast", "dxf"]
+
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+source = { editable = "vendor/visionsuite/packages/vs-measure" }
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+    { name = "visionsuite", editable = "vendor/visionsuite/packages/vs-core" },
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