[AZ-626] Decompose complete: 47 tasks + docs + module layout

Greenfield Steps 1-6 baseline for the autopilot rewrite from legacy
Qt/C++ to a Rust workspace.

- Remove legacy Qt/C++ tree (ai_controller, drone_controller,
  misc/camera, python_scaffold, root Dockerfile, autopilot.pro,
  legacy main.py / requirements.txt).
- Add _docs/00_problem (problem, restrictions, acceptance criteria,
  security approach, input data + fixtures).
- Add _docs/01_solution/solution_draft01.
- Add _docs/02_document (architecture, system-flows, data_model,
  glossary, decision-rationale, deployment, 13 component descriptions,
  tests/ specs, FINAL_report, module-layout).
- Add _docs/02_tasks/todo with 47 task specs (AZ-640..AZ-686, one
  bootstrap + 46 component tasks) and _dependencies_table.md.
- Add .cursor/rules/artifact-srp.mdc (single-responsibility rule for
  canonical _docs artifacts).
- Track autodev state in _docs/_autodev_state.md (Step 6 completed,
  ready for Step 7 Implement).

Jira: bootstrap AZ-626; component epics AZ-627..AZ-639; tasks
AZ-640..AZ-686. Total complexity 173 points across 12 epics.

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

_docs/02_document/components/telemetry_stream/description.md

@@ -0,0 +1,78 @@
+# Component — `telemetry_stream`
+
+**Layer**: Telemetry plane (always-on, parallel to the decision loop)
+**Status**: forward-looking design (Rust)
+
+## 1. Purpose
+
+Continuous, always-on push of the camera feed + UAV telemetry + bbox overlay to the Ground Station API over modem. Carries operator commands (confirm / decline / target-follow start / target-follow release) on the return path. Independent of the decision loop — the operator always sees the live feed, not just on detection.
+
+## 2. Inputs
+
+| Input | Source | Cadence | Notes |
+|---|---|---|---|
+| Decoded `Frame` | `frame_ingest` | up to 30 fps | Re-encoded for the modem link bandwidth. |
+| `DetectionBatch` | `detection_client` | per frame | Used to build the bbox overlay (server-burn-in or client-render — see Open Questions). |
+| `MovementCandidate` (zoom-out + zoom-in) | `scan_controller` (forwarded) | per candidate | Surfaced in operator overlay; the `source_zoom_band` tag is preserved so the overlay can render zoom-out vs zoom-in candidates differently. |
+| UAV telemetry | `mavlink_layer` (via `mission_executor`) | 10 Hz | Position, attitude, mode, sys-status. |
+| Gimbal state | `gimbal_controller` | per change | yaw / pitch / zoom. |
+| `POI` events | `operator_bridge` | per POI surface / dequeue | Passed straight through. |
+| Operator commands | Ground Station (return path) | event | Forwarded to `operator_bridge`. |
+
+## 3. Outputs
+
+| Output | Consumer | Shape |
+|---|---|---|
+| Outbound stream | Ground Station API (over modem) | per stream protocol (TBD — see Open Questions) |
+| Inbound operator commands | `operator_bridge` | event |
+| Health metric | health aggregator | `link_state`, `bandwidth_used_mbps`, `frame_drop_rate`, `last_command_received_ts`. |
+
+## 4. Key Responsibilities
+
+- Encode and push the camera feed + telemetry + bbox overlay continuously, regardless of detection state.
+- Apply bandwidth-aware rate adaptation (drop bbox-overlay frequency before frame frequency; drop frame frequency before resolution).
+- Surface the modem link state to the health aggregator; `operator_bridge` consults this to decide whether to surface POIs.
+- Receive operator commands on the return path; forward to `operator_bridge` with monotonic timestamps.
+
+## 5. Internal State
+
+- Stream session handle.
+- Rate-adaptation state machine.
+- In-flight frame buffer (bounded).
+
+State is in-process only.
+
+## 6. Failure Modes
+
+| Failure | Detection | Behaviour |
+|---|---|---|
+| Modem link down | transport error / heartbeat | Surface `link_lost`; pause outbound push (do not buffer indefinitely); `operator_bridge` pauses POI surfacing. |
+| Bandwidth saturation | adaptive monitor | Reduce bbox-overlay rate, then frame rate, then resolution; surface to health → yellow. |
+| Inbound command unparseable | parser error | Reject; ack with error; do not act. |
+| Inbound command from unauthenticated peer | session check (per Ground Station contract) | Reject; alert. |
+
+## 7. Dependencies
+
+**In-process** (input): `frame_ingest`, `detection_client`, `scan_controller`, `mavlink_layer`, `gimbal_controller`, `operator_bridge`.
+**In-process** (output): `operator_bridge` (return-path commands).
+
+**External**: Ground Station API. Contract owner: `../_docs/04_system_design_clarifications.md`.
+
+## 8. Non-Functional Targets
+
+| Concern | Target |
+|---|---|
+| End-to-end glass-to-operator latency | bounded by modem characteristics; target ≤2 s p99 on a healthy link |
+| Always-on | yes; not detection-gated |
+| Rate adaptation | smooth; no sudden full-resolution → no-feed transitions |
+| Outbound buffering | bounded; no unbounded growth on slow link |
+
+## 9. Open Questions
+
+- **Ground Station API contract** (`architecture.md §8 Q2`): stream protocol (WebRTC / WebSocket-H.264 / gRPC server-streaming?), session/auth model, bbox-overlay rendering (server-side burn-in vs client-side render).
+
+## 10. References
+
+- `architecture.md §3`, `§5 Architectural Principles` (always-on stream, no silent error swallowing), `§7.6 Integration and reliability`.
+- `system-flows.md §F5 Operator round trip`.
+- `../_docs/04_system_design_clarifications.md`.