docs(tier2): apply user feedback - 6 workflow conventions

User feedback from the first sandbox run (send_result_to_send_20260616,
2026-06-17) identified 6 conventions Tier 2 must follow. Update the agent
prompt template, slash command template, user guide, and workflow doc:

1. Test runner: ALWAYS use 'uv run python scripts/run_tests_batched.py'
   (NOT 'uv run pytest'). The batched runner provides tier filtering,
   parallelization (xdist), and a summary table that direct pytest lacks.

2. Default branch: this repo uses 'master', not 'main'. The Tier 2 slash
   command now does 'git fetch origin master' (was 'origin main').

3. Line endings: preserve existing. This repo has a mix of CRLF and LF;
   a repo-wide LF standardization is a future track.

4. Throw-away scripts: write to 'scripts/tier2/artifacts/<track>/', NOT
   the base 'scripts/tier2/' directory. The base is reserved for
   production code; throw-away scripts are kept for archival but
   isolated per-track.

5. End-of-track report: write 'docs/reports/TRACK_COMPLETION_<track>.md'
   and update 'state.toml' to 'status=completed'. The user reads this
   to decide merge. Previously this was implicit; now it's explicit.

6. Run-time expectation: tracks are 1-4 hours. If context runs out, Tier
   2 notes progress to disk and continues. The --resume flag picks up
   from the last completed task.

Also updated the user guide with a 'Conventions' section and a
troubleshooting entry for the resume flow. The verify-the-sandbox
checklist now uses 'origin master' instead of 'origin main'.

docs/guide_tier2_autonomous.md

@@ -75,19 +75,30 @@ Written to `C:\Users\Ed\AppData\Local\manual_slop\tier2_failures\<track>_<timest
 3. Current task (where it stopped)
 4. Last 3 failures
 5. Failcount state
-6. Git state (`git log tier2/<track> ^origin/main`)
+6. Git state (`git log tier2/<track> ^origin/master`)
 7. Recommendation (heuristic-based)
 
 A `.STOPPED` flag file is created alongside the report. The main repo
 can check for it on next Tier 1 session start (an opt-in banner).
 
+## Conventions (added 2026-06-17)
+
+These are enforced by the Tier 2 agent prompt. The agent MUST follow them — they're not optional.
+
+- **Test runner:** Tier 2 always uses `uv run python scripts/run_tests_batched.py`. Never `uv run pytest` directly. The batched runner provides tier-based filtering, parallelization (xdist), and a summary table that direct pytest doesn't.
+- **Default branch:** this repo uses `master` (not `main`). When fetching or branching, use `origin/master`. Tier 2 may otherwise get confused by the missing `main` reference.
+- **Line endings:** Tier 2 preserves existing line endings on edit. This repo has a mix of CRLF and LF; standardizing to repo-wide LF is a future track. For now, do not normalize.
+- **Throw-away scripts:** Tier 2 writes its working scripts to `scripts/tier2/artifacts/<track-name>/`, NOT the base `scripts/tier2/` directory. The base directory is reserved for production code. Throw-away scripts are kept for archival but isolated in a track-specific subdir.
+- **End-of-track report:** at the end of every track, Tier 2 writes `docs/reports/TRACK_COMPLETION_<track-name>.md` (follow the precedent set by `TRACK_COMPLETION_tier2_autonomous_sandbox_20260616.md`) and updates `conductor/tracks/<track-name>/state.toml` to `status = "completed"`. The user reads this report to decide merge.
+- **Run-time expectation:** tracks are expected to take 1-4 hours. If the model reports it is running out of context, Tier 2 notes progress to disk and continues. The user expects autonomous runs to complete without manual "press continue" intervention.
+
 ## Verify the sandbox (manual checklist)
 
 After bootstrap, run these inside the Tier 2 sandboxed OpenCode session
 to verify the bans are enforced:
 
 - [ ] Try `git restore tests/test_failcount.py` — should print "denied"
-- [ ] Try `git push origin main` — should print "denied" (or the pre-push hook fires)
+- [ ] Try `git push origin master` — should print "denied" (or the pre-push hook fires)
 - [ ] Try `git checkout -- src/foo.py` — should print "denied"
 - [ ] Try `git reset --hard HEAD~1` — should print "denied"
 - [ ] Try to read `C:\Users\Ed\Documents\test.txt` (from a Python subprocess) — should print "ACCESS_DENIED"
@@ -112,3 +123,8 @@ And verify allowed operations work:
   `git config core.hooksPath` if you have a custom hooks dir.
 - **"Tier 2 keeps giving up at 30 min"**: increase
   `no_progress_minutes` in `scripts/tier2/failcount.toml`.
+- **"Tier 2 ran out of context"**: the model stopped mid-track. The
+  user (interactive Tier 1) should `cd` to the Tier 2 clone, inspect
+  `<app-data>/tier2/<track>/state.json` for the last completed task,
+  and re-invoke with `/tier-2-auto-execute <track-name> --resume`
+  to continue. The state file persists across runs.