[AZ-696] chore: cycle-2 bootstrap — gitignore tlog inputs, Step 9 PBIs

Pre-implement chore commit to land orchestration artifacts produced by
autodev cycle-2 Step 9 (New Task), so that Step 10 (Implement) starts
against a clean working tree.

What's included:

- .gitignore: exclude _docs/00_problem/input_data/**/*.{tlog,mp4,h264}
  (derkachi.tlog is a 5.8 MB binary input and stays out-of-band).
- _docs/02_tasks/todo/AZ-697..AZ-702: 6 new PBI specs under epic AZ-696
  (tlog ground-truth extractor, mid-flight trim+align, real-flight
  validation runner, replay map viz, HTTP replay API, KHP20S30 calib).
- _docs/02_tasks/_dependencies_table.md: dep edges for the 6 PBIs.
- _docs/_autodev_state.md: status -> in_progress, step 10 cycle 2.
- _docs/_process_leftovers/...opencv_pin_deferred.md: replay-attempt
  timestamp refreshed (gtsam-numpy-2 wheels still not published;
  leftover remains open).

No source code is modified by this commit.

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

_docs/02_tasks/todo/AZ-702_khp20s30_calibration.md

@@ -0,0 +1,106 @@
+# Topotek KHP20S30 camera calibration (factory-sheet approximation)
+
+**Task**: AZ-702_khp20s30_calibration
+**Name**: Provide a calibration JSON for the Topotek KHP20S30 nadir camera (factory-sheet approximation)
+**Description**: Compute and commit a `CameraCalibrationArtifact` JSON for the Derkachi camera (Topotek KHP20S30) from manufacturer factory data. Replaces the `adti26.json` placeholder that AC-3 currently uses. Documents the residual error vs a per-unit checkerboard refinement.
+**Complexity**: 1 point
+**Dependencies**: None
+**Component**: input_data / shared_helpers
+**Tracker**: AZ-702
+**Epic**: AZ-696
+
+## Problem
+
+`_docs/00_problem/input_data/flight_derkachi/camera_info.md` states the
+Topotek KHP20S30 intrinsics are unknown. `tests/e2e/replay/conftest.py`
+(line 50–56) substitutes `tests/fixtures/calibration/adti26.json` as a
+placeholder. AC-3 (≤ 100 m horizontal error for 80 % of ticks) is
+`@xfail` until a real calibration ships.
+
+The cheapest reasonable starting point is a factory-sheet approximation
+— compute `K` from the manufacturer's published focal length + sensor
+geometry, accept the 1–3 % focal-length residual as a documented
+budget, and let AC-3 either PASS or honestly FAIL with the residual
+attributed.
+
+## Outcome
+
+- A calibration JSON `khp20s30_factory.json` exists in the Derkachi
+  input directory, parses against the project's
+  `CameraCalibrationArtifact` schema, and documents the acquisition
+  method as `factory_sheet`.
+- `camera_info.md` is updated to reference the new calibration + the
+  residual budget + the deferral handle (`AZ-XXX_checkerboard_refinement`).
+- AZ-699 (T3) uses this calibration as its `--camera-calibration` input.
+
+## Scope
+
+### Included
+- Source manufacturer factory data for the Topotek KHP20S30 (sensor: 1/2.8" CMOS, 2.13 MP, 1920×1080; lens focal length, FOV, pixel pitch).
+- Compute `K = [[fx, 0, cx], [0, fy, cy], [0, 0, 1]]` from `fx = fy = focal_length_mm × (image_width_px / sensor_width_mm)`.
+- Set distortion to `[0, 0, 0, 0, 0]` (factory-sheet approximation).
+- Set `body_to_camera_se3` to identity-down (nadir; camera-z = aircraft-down).
+- Set `acquisition_method = "factory_sheet"`.
+- Write `_docs/00_problem/input_data/flight_derkachi/khp20s30_factory.json`.
+- Update `_docs/00_problem/input_data/flight_derkachi/camera_info.md`.
+- New unit test under `tests/unit/calibration/` asserting the JSON parses and matches the documented inputs.
+
+### Excluded
+- Physical checkerboard calibration (needs hardware).
+- PnP-from-tlog back-computation (deferred follow-up).
+- Updating `adti26.json` or other test fixtures.
+
+## Acceptance Criteria
+
+**AC-1: Calibration JSON parses**
+Given the new `khp20s30_factory.json`
+When loaded by the project's calibration parser (same schema as `adti26.json`)
+Then it parses without error and all fields are populated
+
+**AC-2: Doc updated**
+Given `camera_info.md` before
+When the calibration is committed
+Then `camera_info.md` says "factory-sheet approximation; per-unit checkerboard refinement deferred — see <future-task>" and lists the residual budget
+
+**AC-3: Unit test snapshot**
+Given the new JSON
+When the unit test runs
+Then it asserts `fx == fy` (square pixels), `cx ≈ width/2`, `cy ≈ height/2`, distortion all zero
+
+**AC-4: T3 consumes this calibration**
+Given AZ-699's `test_derkachi_real_tlog.py`
+When it runs
+Then it loads `khp20s30_factory.json` as `--camera-calibration` (no longer the `adti26.json` placeholder)
+
+## Non-Functional Requirements
+
+**Compatibility**
+- JSON schema MUST be identical to existing calibration fixtures (`adti26.json`) — no schema changes in this task.
+
+## Unit Tests
+
+| AC Ref | What to Test | Required Outcome |
+|--------|-------------|-----------------|
+| AC-1 | JSON loads via existing parser | Object populated |
+| AC-3 | Field values match factory inputs | fx == fy, cx/cy at centre, zero distortion |
+
+## Blackbox Tests
+
+| AC Ref | Initial Data/Conditions | What to Test | Expected Behavior | NFR References |
+|--------|------------------------|-------------|-------------------|----------------|
+| AC-4 | T3 test pointed at new JSON | T3 launches without calibration parse error | Test starts cleanly | Compat |
+
+## Constraints
+
+- MUST follow the calibration contract in `_docs/02_document/contracts/shared_helpers/descriptor_normaliser.md` (or wherever the camera-calibration schema lives).
+- MUST be a single committed JSON — no generator script with side effects.
+
+## Risks & Mitigation
+
+**Risk 1: Factory data unavailable at required precision**
+- *Risk*: Topotek does not publish the exact focal length / sensor width to the precision needed.
+- *Mitigation*: Document the gap; ship with the best-available estimate; flag in `camera_info.md` so T3 surfaces the uncertainty in its failure message.
+
+**Risk 2: Residual error exceeds AC-3 budget**
+- *Risk*: 1–3 % focal-length error may push horizontal error past 100 m at 1 km AGL.
+- *Mitigation*: That's the honest finding. T3 reports it. A follow-up task can pursue checkerboard refinement if needed.