Normalize agent instructions and workplan frontmatter (STATE-WP-0067)

- Align agent files with on-disk workplan prefixes (infer from workplan ids)
- Set workplan domain to registered domain_slug; add topic_slug where applicable
- Repair frontmatter delimiter formatting; migrate legacy task status literals
- Regenerate AGENTS.md, CLAUDE.md, and .claude/rules from State Hub templates

.claude/rules/repo-identity.md

@@ -1,5 +1,5 @@
 **Purpose:** Certification and compliance preparation framework core with external extension support.
 
-**Domain:** markitect
+**Domain:** communication
 **Repo slug:** guide-board
 **Topic ID:** 5571d954-0d30-4950-980d-7bcaaad8e3e2