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

A missing newline fused the closing delimiter onto the last frontmatter value
(`- KONT-WP-0016---`), 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
therefore 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

workplans/CUST-WP-0000-state-hub-v0.1-build-deploy.md

@@ -15,7 +15,8 @@ note: >
   Pre-ADR-001 record. This workplan was created DB-first during the first
   Custodian session (2026-02-24) before the workplan-as-repository-artefact
   convention was established. This file is a retroactive record written on
-  2026-03-11 to satisfy the ADR-001 consistency checker (C-08).---
+  2026-03-11 to satisfy the ADR-001 consistency checker (C-08).
+---
 
 # State Hub v0.1 — Build & Deploy
 

workplans/CUST-WP-0000b-state-hub-v0.2-decisions-dependencies.md

@@ -14,7 +14,8 @@ state_hub_workstream_id: "6585ee66-aa4e-436e-bbec-d83293c33e8f"
 note: >
   Pre-ADR-001 record. This workplan was created DB-first before the
   workplan-as-repository-artefact convention was established. Retroactive
-  file written on 2026-03-11 to satisfy the ADR-001 consistency checker (C-08).---
+  file written on 2026-03-11 to satisfy the ADR-001 consistency checker (C-08).
+---
 
 # State Hub v0.2 — Decisions, Suggestions & Dependencies