docs(runbook): add relay PR evidence template and summary draft

memory-bank/TASK22239-pr-summary.md

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+# TASK22239 PR Summary Draft
+
+## Scope summary
+
+- Added relay-policy governance and rollout controls so timeout/retry/logging changes are treated as operationally sensitive changes.
+- Added a copy/paste PR evidence template for non-prod smoke outcomes, runtime knobs used, and rollback readiness.
+
+## Files changed
+
+- `context/runbook.md`
+- `context/integration-map.md`
+- `memory-bank/change-log.md` (CL-032)
+- `memory-bank/decisions.md` (D-003)
+- `memory-bank/patterns.md` (P-004)
+- `.gitignore` (context tracking enabled)
+
+## Risk notes
+
+- **Auth/Data:** no runtime auth or data-path behavior changes in this slice.
+- **i18n/a11y:** no user-facing route/content behavior changes.
+- **Operational:** process-only hardening; intended to reduce risk in future relay policy updates.
+
+## Validation evidence
+
+- Documentation consistency reviewed across:
+    - `context/runbook.md`
+    - `context/integration-map.md`
+    - `memory-bank/change-log.md`
+    - `memory-bank/decisions.md`
+    - `memory-bank/patterns.md`
+
+## Rollback plan
+
+1. Revert commit(s) from `TASK22239-relay-governance-rollout`.
+2. If needed, restore previous `.gitignore` behavior for `context/` tracking.
+3. Confirm branch clean state and re-run PR checks.