feat(vision): il runner, unica implementazione dell'esecuzione

Aggiunge il sottomodulo vendor/visionsuite (pin f095fcc), src/vision/runner.py
(run_graph/engine_version, pura libreria: niente HTTP, niente DB) e i test.

Deviazione dal brief: vs-task/vs-measure/vs-pm2d dichiarano
requires-python>=3.13 a monte, mentre il monorepo resta a 3.11. L'extra
`vision` porta marker `python_version>='3.13'` cosi' la sync di base
(server+client+dev, 3.11) resta intatta; per lavorare sulla vision serve
`uv sync --extra vision --extra dev --python 3.13`. Ricade sul Task 3: il
worker (Dockerfile.vision) non puo' partire da python:3.11-slim come previsto
dal suo brief, deve usare 3.13.

pyproject.toml

@@ -53,6 +53,15 @@ dev = [
     "coverage>=7.0.0",
 ]
 
+# Vision runner (VisionSuite submodule). vs-task/vs-measure/vs-pm2d require
+# Python >=3.13 upstream; marker keeps the base 3.11 resolution untouched.
+vision = [
+    "visionsuite; python_version>='3.13'",
+    "vs-task; python_version>='3.13'",
+    "vs-measure; python_version>='3.13'",
+    "vs-pm2d; python_version>='3.13'",
+]
+
 [project.scripts]
 # Backend
 server = "uvicorn:run"  # placeholder, real CMD lives in Dockerfile
@@ -70,6 +79,12 @@ 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"]