feat: add triggers to all 38 skill templates

Multi-word, skill-specific trigger keywords for GBrain's RESOLVER.md
router. Each skill gets 3-6 triggers derived from its "Use when asked
to..." description text. Avoids single generic words that would collide
across skills (e.g., "debug this" not "debug").

These are distinct from voice-triggers (speech-to-text aliases) and
serve GBrain's checkResolvable() validation.

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

guard/SKILL.md.tmpl

@@ -7,6 +7,10 @@ description: |
   /freeze (blocks edits outside a specified directory). Use for maximum safety
   when touching prod or debugging live systems. Use when asked to "guard mode",
   "full safety", "lock it down", or "maximum safety". (gstack)
+triggers:
+  - full safety mode
+  - guard against mistakes
+  - maximum safety
 allowed-tools:
   - Bash
   - Read