docs: add Clawdbot skills overview

docs/clawdbot/skills-overview.md

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+# Clawdbot Skills — Overview
+
+This file is the maintained overview of the skills we rely on in our Clawdbot setup.
+
+## Skill categories
+- **Community / packaged skills**: typically installed with Clawdbot or from the community ecosystem.
+- **Custom / maintained by us**: located in `/home/papa/clawd/skills/`.
+
+## Community / packaged skills (currently in use)
+- bluebubbles
+- github
+- gog
+- nano-pdf
+- notion
+- openai-whisper
+- skill-creator
+- slack
+- tmux
+- video-frames
+- weather
+
+## Custom / maintained by us
+- atomaste-reports
+- cad-documenter
+- claude-code-usage
+- dexter
+- email
+- humanizer
+- humanizer-fr
+- stock-analysis
+- thinking-partner
+
+## Source of truth
+- PKM note: `Antoine Brain Extension/3-Resources/Tools/Clawdbot/Clawdbot Skills (Overview).md`
+- Local custom skills: `/home/papa/clawd/skills/`