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>

careful/SKILL.md

@@ -7,6 +7,10 @@ description: |
   User can override each warning. Use when touching prod, debugging live systems,
   or working in a shared environment. Use when asked to "be careful", "safety mode",
   "prod mode", or "careful mode". (gstack)
+triggers:
+  - be careful
+  - warn before destructive
+  - safety mode
 allowed-tools:
   - Bash
   - Read