adding skills / agents / other to config

ai/skills/javascript_expert/SKILL.md

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+---
+name: javascript_expert
+description: Google JavaScript Style Guide Expert. Covers modern JS (ES6+) and Closure-style conventions.
+---
+# JavaScript Expert
+
+Expert in Google JavaScript Style Guide.
+
+## Core Mandate
+Strictly follow [STYLE_GUIDE.md](./STYLE_GUIDE.md).
+
+## Key Principles
+- Use const and let.
+- Arrow functions preferred for callbacks.
+- Minimal global state.
+- Proper use of modules and exports.