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/tests/test_measurements.py

@@ -211,6 +211,43 @@ class TestListMeasurements:
         assert "total" in data
         assert data["total"] >= 3
 
+    async def test_measurement_tec_can_list_measurements(
+        self,
+        client: AsyncClient,
+        measurement_tec_user: User,
+        db_session: AsyncSession,
+    ):
+        """Regression: MeasurementTec must be able to list measurements.
+
+        The Flask client renders task_complete.html by calling GET
+        /api/measurements?version_id=X right after the operator finishes a
+        recipe. The endpoint used to require Metrologist, which silently
+        produced an empty riepilogo for every operator without that role.
+        """
+        recipe = await create_test_recipe(db_session, measurement_tec_user.id)
+        subtask_id, version_id = await _get_subtask_and_version(
+            client, measurement_tec_user, recipe.id
+        )
+
+        for val in [9.8, 10.0, 10.2]:
+            await client.post(
+                "/api/measurements/",
+                headers=auth_headers(measurement_tec_user),
+                json={
+                    "subtask_id": subtask_id,
+                    "version_id": version_id,
+                    "value": val,
+                },
+            )
+
+        resp = await client.get(
+            f"/api/measurements/?version_id={version_id}",
+            headers=auth_headers(measurement_tec_user),
+        )
+        assert resp.status_code == 200, resp.text
+        data = resp.json()
+        assert data["total"] >= 3
+
     async def test_measurement_by_recipe_filter(
         self,
         client: AsyncClient,