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/MKTF-WP-0001-epub3-read-adapter.md

@@ -2,7 +2,7 @@
 id: MKTF-WP-0001
 type: workplan
 title: "EPUB3 Read Adapter"
-domain: markitect
+domain: communication
 status: done
 owner: markitect-filter
 topic_slug: markitect

workplans/MKTF-WP-0002-pdf-read-adapter.md

@@ -2,7 +2,7 @@
 id: MKTF-WP-0002
 type: workplan
 title: "PDF Read Adapter"
-domain: markitect
+domain: communication
 status: done
 owner: markitect-filter
 topic_slug: markitect

workplans/MKTF-WP-0003-source-attachment-manifest-compatibility.md

@@ -2,7 +2,7 @@
 id: MKTF-WP-0003
 type: workplan
 title: "Source Attachment Manifest Compatibility"
-domain: markitect
+domain: communication
 status: done
 owner: markitect-filter
 topic_slug: markitect