chore(drone): update BACKLOG task checklist to reflect actual M1 implementation state

All M1 implementation tasks are done (setup_gitea_oauth, _enrich_deps_with_sso,
recipe_meta.py files, install_steps.sh, functional test, PARITY.md, unit tests).
ADV-drone-01 fixed. Mirror/!testme PR tasks moved to M2. Harness run 4 in flight.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

machine-docs/BACKLOG-drone.md

@@ -12,20 +12,21 @@ _(Builder's section — Adversary read-only)_
 
 - [x] Read plan + Adversary pre-probes
 - [x] Create phase state files (STATUS/JOURNAL/BACKLOG/REVIEW init)
-- [ ] Implement `setup_gitea_oauth()` in `runner/harness/sso.py`
-- [ ] Extend `_enrich_deps_with_sso` in `runner/run_recipe_ci.py` for gitea
-- [ ] Create `tests/gitea/recipe_meta.py`
-- [ ] Create `tests/drone/recipe_meta.py`
-- [ ] Create `tests/drone/install_steps.sh`
-- [ ] Create `tests/drone/functional/test_scm_configured.py`
-- [ ] Create `tests/drone/PARITY.md`
-- [ ] Write unit tests for new harness surface
-- [ ] Mirror drone + gitea on git.autonomic.zone (for M2 CI path)
-- [ ] Open !testme PR for drone recipe
+- [x] Implement `setup_gitea_oauth()` in `runner/harness/sso.py`
+- [x] Extend `_enrich_deps_with_sso` in `runner/run_recipe_ci.py` for gitea
+- [x] Create `tests/gitea/recipe_meta.py`
+- [x] Create `tests/drone/recipe_meta.py`
+- [x] Create `tests/drone/install_steps.sh`
+- [x] Create `tests/drone/functional/test_scm_configured.py` (ADV-drone-01 fixed in 7e7e84d)
+- [x] Create `tests/drone/PARITY.md`
+- [x] Write unit tests for new harness surface (10/10 pass)
+- [ ] Harness run 4 green (PID 2105952 on cc-ci, log /tmp/drone-m1-run4.log)
 - [ ] Claim M1
 
 ### M2 tasks (after M1 PASS)
 
+- [ ] Mirror drone + gitea on git.autonomic.zone (for !testme CI path)
+- [ ] Open !testme PR for drone recipe
 - [ ] CI run via !testme on drone PR — full lifecycle green
 - [ ] Screenshot real + visually verified
 - [ ] Level recorded