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

workplans/KONT-WP-0015-first-release-readiness.md

@@ -2,7 +2,7 @@
 id: KONT-WP-0015
 type: workplan
 title: "First Release Readiness"
-domain: markitect
+domain: communication
 repo: kontextual-engine
 status: completed
 owner: codex
@@ -13,8 +13,7 @@ created: "2026-05-14"
 updated: "2026-05-14"
 state_hub_workstream_id: "cb525023-1139-4d6c-9226-d6fdd1f5fd8f"
 depends_on_workplans:
-  - KONT-WP-0016
----
+  - KONT-WP-0016---
 
 # KONT-WP-0015: First Release Readiness