Add lambda-router agent skill for library consumers

[ConsoleTVs]

Summary

• Add an Agent Skills-compatible skill at .agents/skills/lambda-router/ that teaches LLM coding agents how to use @studiolambda/router v2.0.0
• SKILL.md (291 lines) covers quick start, route definition, components, hooks overview, middleware, SSR/testing, and standalone matcher usage
• Three reference files provide detailed API docs loaded on demand by agents as needed

Skill structure

.agents/skills/lambda-router/
├── SKILL.md                              # Core instructions (291 lines)
└── references/
    ├── route-builder.md                  # createRouter builder API
    ├── hooks-reference.md                # All 16 hooks with signatures and examples
    └── advanced-patterns.md              # Prefetch, forms, redirects, layouts, auth, SSR

What it enables

Any Agent Skills-compatible tool (Claude Code, Cursor, VS Code Copilot, OpenCode, Gemini CLI, etc.) can automatically discover and use this skill when a consumer of the library asks an agent to write code that imports from @studiolambda/router.