feat: add loopback-core AI agent skill for skills.sh

[raymondfeng]

Summary

• Add a reusable AI agent skill (skills/loopback-core/) covering LoopBack 4 core patterns: IoC container, dependency injection, extension point/extension, interceptors, life cycle observers, configuration, and component-based architecture
• Follows the skills.sh convention so anyone can install it via npx skills add loopbackio/loopback-next
• Includes 6 reference docs for detailed API patterns and recipes

Skill Structure

skills/
  loopback-core/
    SKILL.md                              # Main skill with decision tree + quick start
    references/
      context-and-bindings.md             # Context hierarchy, binding types, scopes, views, components
      dependency-injection.md             # Constructor/property/method injection, getters, views
      extension-points.md                 # Extension point/extension pattern, registration, configuration
      interceptors-and-observers.md       # Global interceptors, proxies, lifecycle observers
      configuration.md                    # @config(), dynamic config, custom resolvers
      advanced-recipes.md                 # Custom decorators, class factories, app scaffolding

Test plan

• Verify skill renders correctly on skills.sh after merge
• Test installation via npx skills add loopbackio/loopback-next
• Verify skill triggers correctly in Claude Code when working with @loopback/core patterns

🤖 Generated with Claude Code