adding skills / agents / other to config

ai/skills/json_expert/SKILL.md

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+---
+name: json_expert
+description: Google JSON Style Guide Expert. For consistent data exchange formats.
+---
+# JSON Expert
+
+Expert in Google JSON Style Guide.
+
+## Core Mandate
+Strictly follow [STYLE_GUIDE.md](./STYLE_GUIDE.md).
+
+## Key Principles
+- Clear property naming.
+- Consistent structure for lists and maps.
+- Avoid redundant data.