Closes out the migrate-ci-to-self-hosted convoy with the two
defensive follow-ups Brief 1+2 (PR #132) intentionally deferred.
Brief 3 — Check 8 of `forbidden-patterns` in ci.yml. Greps
`.github/workflows/` for `runs-on: ubuntu-latest` and fails unless
the match is in the documented allowlist (currently
`agent-context-drift.yml` only, per Decision D4). Self-tested
locally against the post-migration tree: 0 violations. Renames the
job from "Forbidden patterns (7 checks)" → "(8 checks)" and
normalizes the older "Check N/6" labels to "N/8" for consistency
(the inherited mix of `/6` and `/7` was a known cosmetic from the
unify-glass-panel-surfaces convoy).
Brief 4 — AGENTS.md § 6 and § 7 updates:
- § 6 "CI behavior": Playwright smoke runtime range updated to
cover post-migration cold vs. warm cache (was a stale 59s figure
from pre-migration ubuntu-latest).
- § 6 new top-level bullet "Self-hosted runner pool" alongside
"CI minute optimizations" — covers where runners live, where
caches are bind-mounted on CT 111, the Postgres rewire on
CT 102, and the agent-context-drift.yml exemption + how Check 8
enforces it.
- § 7 new bullet for the operational story: PAT rotation cadence
+ the D5 one-line `sed` revert path for when axiom is offline
mid-PR-storm. Cross-references the axiom-server CT 111 README
and the Beszel down alert.
Convoy doc — status flipped queued → shipped, shipped_in lists
both PRs, and follow_ups makes the cleanup-stale-ci-runs-cron +
seed-visual-baselines-on-linux items machine-greppable.
Co-authored-by: Cursor <cursoragent@cursor.com>
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