chore: Add AI agent tooling and rename agent documentation (#20609)

Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

.claude/skills

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+../.cursor/skills

.cursor/skills/go/SKILL.md

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+---
+name: go
+description: >
+  Best practices for working with Go codebases. Use when writing, debugging,
+  or exploring Go code, including reading dependency sources and documentation.
+allowed-tools: "Read,Bash(go:*)"
+version: "1.0.0"
+author: "User"
+license: "MIT"
+---
+
+# Go Programming Language
+
+Guidelines for working effectively with Go projects.
+
+## Reading Dependency Source Files
+
+To see source files from a dependency, or to answer questions about a dependency:
+
+```bash
+go mod download -json MODULE
+```
+
+Use the returned Dir path to read the source files.
+
+## Reading Documentation
+
+Use go doc to read documentation for packages, types, functions, etc:
+
+```bash
+go doc foo.Bar       # Documentation for a specific symbol
+go doc -all foo      # All documentation for a package
+```
+
+## Running Programs
+
+Use go run instead of go build to avoid leaving behind build artifacts:
+
+```bash
+go run .             # Run the current package
+go run ./cmd/foo     # Run a specific command
+```