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:** railiance-fabric - (fill in purpose)
 
-**Domain:** railiance
+**Domain:** financials
 **Repo slug:** railiance-fabric
 **Topic ID:** ca369340-a64e-442e-98f1-a4fa7dc74a38