chore: regenerate all SKILL.md files and update golden fixtures

Regenerated from updated templates (triggers, brain placeholders,
resolver DX improvements, preamble health check). Golden fixtures
updated to match.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

freeze/SKILL.md

@@ -7,6 +7,10 @@ description: |
   "fixing" unrelated code, or when you want to scope changes to one module.
   Use when asked to "freeze", "restrict edits", "only edit this folder",
   or "lock down edits". (gstack)
+triggers:
+  - freeze edits to directory
+  - lock editing scope
+  - restrict file changes
 allowed-tools:
   - Bash
   - Read