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

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

workplans/NK-WP-0011-enterprise-federation-saml.md

@@ -18,7 +18,8 @@ supersedes_tasks:
   - NK-WP-0001-T05
   - NK-WP-0001-T06
   - NK-WP-0001-T07
-  - NK-WP-0001-T08---
+  - NK-WP-0001-T08
+---
 
 # NK-WP-0011 — Enterprise Federation & SAML (Expanded-Mode Keycloak)