[AZ-961] accuracy_report: rename tlog_path -> ground_truth_path

ReportContext.tlog_path was widened in-place by AZ-959 to mean
"ground-truth source path" without renaming, leaving the rendered
report's "- Tlog: <csv_path>" line cosmetically wrong for CSV
runs. This rename + label fix completes the cleanup.

- helpers/accuracy_report.py: field rename + docstring update +
  rendered line now reads "- Ground truth: <path>" for both
  inputs.
- replay_api/app.py: kwarg updated, AZ-959 inline comment about
  the overload removed (field name now carries the intent).
- tests/unit/test_az699_report_writer.py: fixture updated, two
  new symmetric tests assert the canonical label for tlog AND
  csv inputs (AC-2).
- tests/e2e/replay/_e2e_orchestrator.py +
  test_derkachi_real_tlog.py: kwarg updated.

Tests: 62/62 green across test_az699_report_writer.py,
test_az700_render_map.py, test_az701_replay_api.py.

CSV-replay-input chain (AZ-959 + AZ-960 + AZ-961) is now coherent:
- API accepts (video, csv) with XOR validation
- /static/example-csv serves the AZ-896 reference doc
- Runner dispatches --imu vs --tlog argv
- Report renders with source-agnostic "Ground truth:" label
- Map renders from CSV truth via gps-denied-render-map dispatch

Bookkeeping: AZ-961 spec moved todo/ → done/, dep-table preamble
eighth bump documents the rename + summarises the cycle-4 CSV
chain, state.md records batch 7 complete.

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

tests/e2e/replay/_e2e_orchestrator.py

@@ -349,7 +349,7 @@ def run_e2e_orchestration(
 
     context = ReportContext(
         run_date_utc=effective_run_date,
-        tlog_path=tlog_path,
+        ground_truth_path=tlog_path,
         video_path=video_path,
         calibration_acquisition_method=read_calibration_acquisition_method(
             calibration_path

tests/e2e/replay/test_derkachi_real_tlog.py

@@ -280,7 +280,7 @@ def test_az699_real_flight_validation_emits_verdict_and_report(
         run_date_utc=datetime.datetime.now(datetime.timezone.utc)
         .date()
         .isoformat(),
-        tlog_path=tlog_path,
+        ground_truth_path=tlog_path,
         video_path=video_path,
         calibration_acquisition_method=_read_calibration_acquisition_method(
             calibration_path