[AZ-960] render-map: dispatch --truth loader on extension (CSV+tlog)

load_ground_truth_track now dispatches on truth_path.suffix:
- .csv → load_csv_ground_truth (AZ-894)
- else (.tlog, .bin, no ext) → load_tlog_ground_truth (AZ-697)

Removes the AZ-959 short-circuit in SubprocessReplayRunner.
_maybe_render_map so CSV-path replay jobs ship with the same
map.html artefact as tlog jobs. Both ground-truth DTOs expose
row-aligned (lat_deg, lon_deg) records so the renderer needs no
other changes.

Touches:
- src/gps_denied_onboard/cli/render_map.py: dispatch +
  source-agnostic tooltip + --truth CLI help expanded
- src/gps_denied_onboard/replay_api/app.py: workaround removed,
  truth_path resolution picks whichever input was uploaded

Tests: 44/44 green across test_az700_render_map.py +
test_az701_replay_api.py:
- 17 pre-existing render-map tests pass unchanged (AC-2)
- New test_load_ground_truth_track_dispatches_to_csv_loader (AC-1)
- New test_load_ground_truth_track_csv_propagates_schema_error
  (AC-4: malformed CSV raises ReplayInputAdapterError)
- New test_cli_renders_map_with_csv_truth (AC-1 end-to-end)
- AZ-959 test_post_replay_csv_path_returns_200... extended to
  assert map_html_url is now present (AC-3)

Bookkeeping: AZ-960 spec moved todo/ → done/, dep-table preamble
seventh bump documents the landing + AC coverage, state.md records
batch 6 complete with AZ-961 as next.

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

tests/unit/test_az700_render_map.py

@@ -371,3 +371,92 @@ def test_load_ground_truth_track_returns_lat_lon_pairs(tmp_path: Path) -> None:
     for lat, lon in track:
         assert 49.99 < lat < 50.01
         assert 29.99 < lon < 30.01
+
+
+# ---------------------------------------------------------------------
+# AZ-960 — CSV-path dispatch for --truth
+
+
+def _write_minimal_csv(path: Path) -> None:
+    """Write a tiny AZ-896-schema CSV with 3 GPS rows for AZ-960 tests."""
+    header = (
+        "timestamp(ms),Time,"
+        "SCALED_IMU2.xacc,SCALED_IMU2.yacc,SCALED_IMU2.zacc,"
+        "SCALED_IMU2.xgyro,SCALED_IMU2.ygyro,SCALED_IMU2.zgyro,"
+        "GLOBAL_POSITION_INT.lat,GLOBAL_POSITION_INT.lon,"
+        "GLOBAL_POSITION_INT.alt,GLOBAL_POSITION_INT.vx,"
+        "GLOBAL_POSITION_INT.vy,GLOBAL_POSITION_INT.vz,"
+        "GLOBAL_POSITION_INT.hdg"
+    )
+    rows = [
+        "0,0.0,21,-3,-984,52,32,-5,50.000,30.000,141290,0,0,0,35041",
+        "100,0.1,-68,-9,-995,58,-17,1,50.0005,30.0005,141360,0,0,0,35042",
+        "200,0.2,9,108,-988,69,-65,13,50.001,30.001,141410,0,0,0,35048",
+    ]
+    path.write_text(header + "\n" + "\n".join(rows) + "\n")
+
+
+def test_load_ground_truth_track_dispatches_to_csv_loader(
+    tmp_path: Path,
+) -> None:
+    # Arrange — AC-1: csv extension routes through load_csv_ground_truth
+    csv_path = tmp_path / "data_imu.csv"
+    _write_minimal_csv(csv_path)
+
+    # Act
+    track = load_ground_truth_track(csv_path)
+
+    # Assert
+    assert len(track) == 3
+    for lat, lon in track:
+        assert 49.999 < lat < 50.002
+        assert 29.999 < lon < 30.002
+
+
+def test_load_ground_truth_track_csv_propagates_schema_error(
+    tmp_path: Path,
+) -> None:
+    # Arrange — AC-4: malformed CSV fails fast via ReplayInputAdapterError
+    csv_path = tmp_path / "bad.csv"
+    csv_path.write_text(
+        "timestamp(ms),SCALED_IMU2.xacc,GLOBAL_POSITION_INT.lat\n"
+        "0,0,50.0\n"
+    )
+    from gps_denied_onboard.replay_input.errors import ReplayInputAdapterError
+
+    # Act / Assert
+    with pytest.raises(ReplayInputAdapterError, match="Time"):
+        load_ground_truth_track(csv_path)
+
+
+def test_cli_renders_map_with_csv_truth(tmp_path: Path) -> None:
+    # Arrange — AC-1 end-to-end: CLI accepts --truth foo.csv
+    csv_path = tmp_path / "data_imu.csv"
+    _write_minimal_csv(csv_path)
+    estimated = tmp_path / "estimator.jsonl"
+    _write_jsonl(
+        estimated,
+        [
+            {"position_wgs84": {"lat_deg": 50.0, "lon_deg": 30.0, "alt_m": 100}},
+            {"position_wgs84": {"lat_deg": 50.001, "lon_deg": 30.001, "alt_m": 101}},
+        ],
+    )
+    output = tmp_path / "map.html"
+
+    # Act
+    rc = main(
+        [
+            "--estimated", str(estimated),
+            "--truth", str(csv_path),
+            "--output", str(output),
+        ]
+    )
+
+    # Assert
+    assert rc == 0
+    assert output.is_file()
+    body = output.read_text()
+    assert body.startswith("<!DOCTYPE html>")
+    assert "L.polyline" in body
+    assert '"color": "red"' in body
+    assert '"color": "blue"' in body