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/kaizen-agentic-WP-0006-scheduled-agent-execution.md

@@ -2,7 +2,7 @@
 id: KAIZEN-WP-0006
 type: workplan
 title: "Scheduled Agent Execution via activity-core (v1.3.0)"
-domain: custodian
+domain: agents
 repo: kaizen-agentic
 status: done
 owner: kaizen-agentic
@@ -85,8 +85,7 @@ tasks:
 - id: T18
   state_hub_task_id: 73986472-bf19-4b13-af1b-6505ab944459
   status: done
-  title: Update wiki/EcosystemIntegration.md and CHANGELOG for v1.3.0
----
+  title: Update wiki/EcosystemIntegration.md and CHANGELOG for v1.3.0---
 
 # KAIZEN-WP-0006 — Scheduled Agent Execution via activity-core
 
@@ -130,7 +129,6 @@ flowchart LR
 
 Kaizen-agentic does **not** invoke Claude directly; it **prepares** and **validates**
 the scheduled run contract.
-
 ---
 
 ## Background