[AZ-423] [AZ-427] Add FT-P-19 + FT-N-05 blackbox tests

Implement the AC-8.6 (top-K=10 retrieval scale-ratio + scene-change
PARTIAL) and AC-8.2 / AC-NEW-6 (stale aged-tile rejection) blackbox
scenarios.

AZ-423 (FT-P-19, 3pt) helpers + scenario:
- retrieval_evaluator.py — top-K within-distance evaluator (60 stills
  vs 100 m budget), scene-change PARTIAL recorder (always emits
  PARTIAL on the 2 _gmaps.png pairs), FDR record projectors, CSV
  writers.
- tests/positive/test_ft_p_19_sat_reloc_scale.py (6 parametrised
  variants).

AZ-427 (FT-N-05, 2pt) helpers + scenario:
- aged_tile_rejection_evaluator.py — Signal A (stale rejection at
  load) + Signal B (per-frame downgrade) decision matrix, reuses
  ALLOWED_SOURCE_LABELS from estimate_schema.
- tests/negative/test_ft_n_05_stale_tile_rejection.py (12 parametrised
  variants: FC × VIO × {7mo/active-conflict, 13mo/rear}).

48 new unit tests cover every helper branch. Both scenarios skip
when sitl_replay_ready is false and fail loudly when fixture records
are missing.

Per-batch review: PASS_WITH_WARNINGS (2 Low — production-dependency
surface, FDR-kind constant duplication).
Cumulative review 82-84: PASS (2 Low carry-over / hygiene candidate).

Co-authored-by: Cursor <cursoragent@cursor.com>

e2e/_unit_tests/test_directory_layout.py

@@ -55,6 +55,8 @@ E2E_ROOT = Path(__file__).resolve().parents[1]
         "runner/helpers/tile_cache_inspector.py",
         "runner/helpers/mid_flight_tile_evaluator.py",
         "runner/helpers/mock_suite_sat_audit.py",
+        "runner/helpers/retrieval_evaluator.py",
+        "runner/helpers/aged_tile_rejection_evaluator.py",
         "runner/helpers/cold_start_evaluator.py",
         "runner/helpers/outlier_tolerance_evaluator.py",
         "runner/helpers/outage_request_evaluator.py",
@@ -116,10 +118,12 @@ E2E_ROOT = Path(__file__).resolve().parents[1]
         "tests/positive/test_ft_p_16_offline_only.py",
         "tests/positive/test_ft_p_17_mid_flight_tiles.py",
         "tests/positive/test_ft_p_18_no_raw_retention.py",
+        "tests/positive/test_ft_p_19_sat_reloc_scale.py",
         "tests/negative/test_ft_n_01_outlier_tolerance.py",
         "tests/negative/test_ft_n_02_sharp_turn_failure.py",
         "tests/negative/test_ft_n_03_outage_reloc.py",
         "tests/negative/test_ft_n_04_blackout_spoof.py",
+        "tests/negative/test_ft_n_05_stale_tile_rejection.py",
         "tests/negative/test_ft_n_06_mid_flight_freshness.py",
     ],
 )