chore(ci): document and harden workflow pipeline (#241)

* docs(ci): add CI workflow map and cross-links

* chore(ci): harden workflow determinism and safety

* chore(ci): address workflow review feedback

* style(ci): normalize workflow and ci-map formatting

docs/pr-workflow.md

@@ -9,6 +9,8 @@ This document defines how ZeroClaw handles high PR volume while maintaining:
 - High sustainability
 - High security
 
+Related reference: [`docs/ci-map.md`](ci-map.md) for per-workflow ownership, triggers, and triage flow.
+
 ## 1) Governance Goals
 
 1. Keep merge throughput predictable under heavy PR load.