feat: add trigger phrases to skill descriptions for better model matching (v0.6.4.1) (#169)

* feat: add trigger phrases to skill descriptions for better model matching

Anthropic's skill best practices: "the description field is not a summary —
it's when to trigger." Add explicit "Use when asked to..." phrases to 12 skill
descriptions so Claude's auto-discovery works with natural language requests
like "deploy this" or "check my diff", not just explicit /slash-commands.

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

* docs: add on-demand hooks and telemetry to TODOS.md

Captures two ideas from Anthropic's skill best practices post:
- /careful, /freeze, /guard on-demand hook skills (P3)
- Skill usage telemetry via preamble JSONL append (P3)

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

* chore: bump version and changelog (v0.6.4.1)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* docs: exclude internal details from CHANGELOG style guide

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

---------

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

retro/SKILL.md

@@ -5,6 +5,7 @@ description: |
   Weekly engineering retrospective. Analyzes commit history, work patterns,
   and code quality metrics with persistent history and trend tracking.
   Team-aware: breaks down per-person contributions with praise and growth areas.
+  Use when asked to "weekly retro", "what did we ship", or "engineering retrospective".
 allowed-tools:
   - Bash
   - Read

retro/SKILL.md.tmpl

@@ -5,6 +5,7 @@ description: |
   Weekly engineering retrospective. Analyzes commit history, work patterns,
   and code quality metrics with persistent history and trend tracking.
   Team-aware: breaks down per-person contributions with praise and growth areas.
+  Use when asked to "weekly retro", "what did we ship", or "engineering retrospective".
 allowed-tools:
   - Bash
   - Read