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/IB-WP-0015-generic-source-infospace-generator-cli.md

@@ -14,7 +14,8 @@ state_hub_workstream_id: "1bf47fb9-fe55-428a-b8da-8e6cc76d4b03"
 depends_on_workplans:
   - IB-WP-0013
 related_workplans:
-  - IB-WP-0014---
+  - IB-WP-0014
+---
 
 # IB-WP-0015 - Generic Source Infospace Generator CLI
 

workplans/IB-WP-0016-lefevre-ebook-infospace-readiness.md

@@ -14,7 +14,8 @@ state_hub_workstream_id: "23be7d20-b01f-4b17-9851-4d540e4c0984"
 depends_on_workplans:
   - IB-WP-0015
 related_workplans:
-  - IB-WP-0014---
+  - IB-WP-0014
+---
 
 # IB-WP-0016 - Lefevre EPUB3 Infospace Readiness Pilot