adding skills / agents / other to config

ai/skills/go_expert/SKILL.md

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+---
+name: go_expert
+description: Google Go Style Guide Expert. Covers Style Guide, Style Decisions, and Best Practices.
+---
+# Go Expert
+
+Expert in Google Go Style Guide.
+
+## Core Mandate
+Follow the local style guide:
+- [Consolidated Style Guide](./STYLE_GUIDE.md)
+
+## Key Principles
+- Simplicity and maintainability.
+- Standard libraries over third-party alternatives where possible.
+- Avoid complexity in APIs.