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/CE-WP-0001-foundations.md

@@ -16,7 +16,8 @@ spec_refs:
   - wiki/ProductRequirementsDocument.md
   - wiki/ArchitectureOverview.md
   - wiki/SharedContracts.md
-  - wiki/DependencyMap.md---
+  - wiki/DependencyMap.md
+---
 
 # CE-WP-0001 — Foundations
 

workplans/CE-WP-0002-pdf-review-slice.md

@@ -16,7 +16,8 @@ depends_on_workplan: CE-WP-0001
 spec_refs:
   - wiki/ProductRequirementsDocument.md
   - wiki/ArchitectureOverview.md
-  - wiki/SharedContracts.md---
+  - wiki/SharedContracts.md
+---
 
 # CE-WP-0002 — PDF Review Slice
 

workplans/CE-WP-0003-form-binding-visual-guide.md

@@ -16,7 +16,8 @@ depends_on_workplan: CE-WP-0002
 spec_refs:
   - wiki/ProductRequirementsDocument.md
   - wiki/ArchitectureOverview.md
-  - wiki/SharedContracts.md---
+  - wiki/SharedContracts.md
+---
 
 # CE-WP-0003 — Form Binding + Visual Guide
 

workplans/CE-WP-0004-citation-card-export.md

@@ -16,7 +16,8 @@ depends_on_workplan: CE-WP-0002
 spec_refs:
   - wiki/ProductRequirementsDocument.md
   - wiki/ArchitectureOverview.md
-  - wiki/SharedContracts.md---
+  - wiki/SharedContracts.md
+---
 
 # CE-WP-0004 — Citation Card Export
 

workplans/CE-WP-0005-demo-sessions-zip-archive.md

@@ -16,7 +16,8 @@ depends_on_workplan: CE-WP-0004
 spec_refs:
   - wiki/ProductRequirementsDocument.md
   - wiki/ArchitectureOverview.md
-  - wiki/SharedContracts.md---
+  - wiki/SharedContracts.md
+---
 
 # CE-WP-0005 — Demo App: Sessions + Uploads + ZIP Archive