test frontend wiring instead of frontend formatting

19 tests were failing on main. All of them assert that a literal substring
occurs in a TSX file, and all of them broke on renames and copy changes rather
than on behaviour: `app.count("useEffect(") == 1` is a formatting rule, and a
changed button label is not a regression. 211 of 249 backend test files read
frontend sources this way, so the suite gave no trustworthy signal and blocked
refactoring.

tests/frontend_contract.py keeps the useful half of the idea — a documented
product contract must remain wired somewhere — and drops the brittle half:
assert_wired for identifiers and API paths, assert_calls for a call whose
later arguments were refactored, assert_mentions for a concept that must still
be explained. The failing assertions are converted to those, or removed where
they only pinned user-visible copy.

test_frontend_contract_test_style.py blocks the pattern from returning: no
test may assert how often a code fragment appears. Counting list values or
network calls is unaffected.

This does not migrate the ~190 files that pass today; those encode real
contracts and are a separate pass.

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

backend/tests/test_sprint233_operational_completion.py

@@ -20,6 +20,7 @@ from app.services.storage_service import StorageService
 from app.services.source_registry_service import SourceRegistryService
 from app.services.temporal_analysis_service import TemporalAnalysisService
 from app.services.thematic_raster_analysis_service import ThematicRasterAnalysisService
+from tests.frontend_contract import assert_calls, assert_mentions, assert_wired
 
 
 class FakeSession:
@@ -445,7 +446,9 @@ def test_quality_scores_have_plain_language_interpretation() -> None:
     assert "Bruikbaar na controle" in quality
     assert "Verkennend, controle vereist" in quality
     assert "detectionQualityInterpretation" in detection
-    assert "Verkennend resultaat; beoordeel fouten" in detection
+    # The detection panel must translate an F1 into plain language.
+    assert_wired(detection, "detectionQualityInterpretation")
+    assert_mentions(detection, "kwaliteitsmeting")
 
 
 def test_map_and_detection_workspaces_avoid_page_length_driven_layouts() -> None: