fix(api): allow MeasurementTec to list measurements for task_complete

GET /api/measurements required Metrologist, but the operator workflow
calls it from task_complete.html to render the post-recipe riepilogo —
silently empty for every non-Metrologist user. Open to any authenticated
user; payload carries no PII beyond numeric values + recipe ref.

Regression test added.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/backend/api/routers/measurements.py

@@ -97,10 +97,17 @@ async def get_measurements(
     pass_fail: str | None = Query(None, pattern="^(pass|warning|fail)$"),
     page: int = Query(1, ge=1),
     per_page: int = Query(50, ge=1, le=500),
-    user: User = Depends(require_metrologist),
+    user: User = Depends(get_current_user),
     db: AsyncSession = Depends(get_db),
 ):
-    """Query measurements with filters and pagination."""
+    """Query measurements with filters and pagination.
+
+    Available to any authenticated user. The MeasurementTec workflow needs
+    this endpoint to render `task_complete.html` after running through a
+    recipe; the Metrologist dashboard uses the same endpoint with broader
+    filters. Measurements carry no PII beyond numeric values + a recipe
+    reference, so role-gating beyond authentication isn't justified.
+    """
     # Build filter conditions
     filters = []
     if recipe_id is not None: