README.md / README.en.md:
- Add ai-json output format
- Add inspect options (--debug-url, --show-path, --timeout, --retries)
- Add images options (--list-frames, --timeout)
- Add query options (--timeout, --retries)
- Add Output Control section (-v flag, pipe-safe JSON, cache warning)

CLAUDE.md:
- Update architecture diagram with new files
- Add ClientContextBuilder pattern documentation
- Add FetchResult/DataSource/CacheHit documentation
- Add output design section (stdout/stderr/tracing)

SKILL.md:
- Restructure for AI agent optimization
- Add task-oriented sections (When to Use, Core Tasks, Error Recovery)
- Add URL handling and output format reference tables
- Add workflow examples

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>