docs(governance): track context docs and add relay rollout controls

memory-bank/patterns.md

@@ -89,3 +89,27 @@ Example paths:
 - `pages/api/endpoint/getadvancedsearch_api.js`
 - `pages/api/endpoint/getdnscoords_api.js`
 - `tests/phase21/relay-forwarding-hardening.test.cjs`
+
+### P-004: Relay Policy Change Bundle (Governance + Smoke + Rollback)
+
+date: 2026-03-24  
+author: Cline  
+scope: relay policy changes + rollout documentation  
+type: pattern  
+rationale: Relay reliability changes can alter runtime behavior without changing endpoint contracts; bundle process controls and operational checks together to reduce regression risk.  
+impact: Improves release confidence and standardizes operational readiness for relay policy updates.  
+status: accepted
+
+Pattern:
+For relay timeout/retry/logging policy updates, ship one documentation bundle that includes governance checklist, non-prod smoke matrix, monitoring checks, and rollback instructions.
+
+When to use:
+
+- Any change to retry classification, timeout defaults/bounds, or relay logging behavior
+- Any change to relay environment tuning guidance
+
+Example paths:
+
+- `context/runbook.md`
+- `memory-bank/change-log.md`
+- `memory-bank/decisions.md`