test: suite pytest sintetica (GT pose note) + deps dev pytest/ruff

11 test senza dipendenza dalle immagini Test/ (non versionate):
- precisione/recall su 7 pose GT (soglie 0.2-0.5 deg, 0.3-1.0 px,
  margine 3-4x sulle misure Fase 2)
- unit: angle_list con estremi, clamp piramide, save/load roundtrip,
  no collisione cache scena, mask poligonale, find non addestrato
Config ruff in pyproject (E702/E402 idiomi del codebase esclusi).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

pyproject.toml

@@ -10,6 +10,7 @@ dependencies = [
     "pillow>=12.2.0",
     "python-multipart>=0.0.26",
     "uvicorn[standard]>=0.34",
+    "ezdxf>=1.3",
 ]
 
 [project.scripts]
@@ -19,4 +20,14 @@ pm2d-bench = "pm2d.bench:main"
 [dependency-groups]
 dev = [
     "httpx>=0.28.1",
+    "pytest>=8.0",
+    "ruff>=0.8",
 ]
+
+[tool.ruff]
+line-length = 100
+
+[tool.ruff.lint]
+select = ["E", "F"]
+# E702 (a; b) ed E402 (import dopo codice) sono idiomi voluti del codebase
+ignore = ["E501", "E741", "E702", "E731", "E402"]