[autodev] step-11 path-3: calibration fix + harness drift report

Attempted Path-3 (Full SITL with community images) for the SUT Reality
Gate. Discovered sitl_observer is offline-fixture replay, not a live
SITL client -- compose-file SITL services in environment.md are
aspirational. The real Path-3 needs the fixture builders + SUT CLI
end-to-end, which surfaced 5 additional integration drifts (H-10..H-14)
on top of the prior 9.

Fixes:
- tests/fixtures/calibration/adti26.json: body_to_camera_se3 was a
  {rotation_xyzw, translation_xyz_m} dict; runtime_root/_replay_branch.py
  loader strictly expects a 4x4 SE3. Identity quaternion + zero
  translation = identity 4x4, semantically equivalent.

New files:
- tests/fixtures/replay_config_minimal.yaml: minimal replay-mode config
  for harness reproduction (mode=replay, ardupilot_plane defaults).
- .gitignore: e2e/fixtures/sitl_replay/ (generated by build_p0X_fixtures).

Documentation:
- Step 11 report: appended Path-3 attempt section.
- Leftover doc: H-10..H-14 ticket payloads added.
- Autodev state: reflects Path-3 outcome.

Step 11 stays blocked; H-13 (auto-sync AC-8 hard-fails on stationary
fixtures) requires a SUT design decision and cannot be unilaterally
fixed mid-session.

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

.gitignore

@@ -43,6 +43,7 @@ tests/fixtures/flight_derkachi/*.h264
 tests/fixtures/flight_derkachi/*.tlog
 tests/fixtures/tiles_corpus/*.jpg
 tests/fixtures/tiles_corpus/*.png
+e2e/fixtures/sitl_replay/
 
 # Editor / OS noise
 .idea/