fix(workplans): terminate frontmatter that ran into the document

A missing newline fused the closing delimiter onto the last frontmatter value,
or fused a value onto the following key. Either way the frontmatter never
terminates and the whole body is swallowed.

Because workplan files are selected by 'type: workplan', such a file is not
invalid but invisible: it appears in no projection, raises no error, and is
reported as neither a workplan nor a problem. A forge-derived reset would read
its correct hub record as no longer deriving and propose retiring live work.

Only the missing newline is inserted; no value is altered.

Refs STATE-WP-0083-T08

Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 2583210@bnt-lap001
Assistant-Session: f2bff2d5-e9b2-4338-92ca-10282a927006

workplans/KAIZEN-WP-0006-scheduled-agent-execution.md

@@ -85,7 +85,8 @@ tasks:
 - id: T18
   state_hub_task_id: 73986472-bf19-4b13-af1b-6505ab944459
   status: done
-  title: Update wiki/EcosystemIntegration.md and CHANGELOG for v1.3.0state_hub_workstream_id: "d4edb92b-526f-4ee4-8efe-a9fa84ab6dff"
+  title: Update wiki/EcosystemIntegration.md and CHANGELOG for v1.3.0
+  state_hub_workstream_id: "d4edb92b-526f-4ee4-8efe-a9fa84ab6dff"
 ---
 
 # KAIZEN-WP-0006 — Scheduled Agent Execution via activity-core

workplans/KAIZEN-WP-0007-agent-authoring-doc-generation.md

@@ -36,7 +36,8 @@ tasks:
 - id: T06
   state_hub_task_id: 6715aa6f-1ee0-4f22-9249-f1cd41763cd1
   status: done
-  title: Docs, CLI cheat sheet, CHANGELOG for v1.4.0state_hub_workstream_id: "a8bc88a4-0ee3-44c6-aff5-9d7f54a316f5"
+  title: Docs, CLI cheat sheet, CHANGELOG for v1.4.0
+  state_hub_workstream_id: "a8bc88a4-0ee3-44c6-aff5-9d7f54a316f5"
 ---
 
 # KAIZEN-WP-0007 — Agent Authoring & Doc Generation