## Summary
Add `skill-seekers sync-config` subcommand that crawls a docs site's navigation,
diffs discovered URLs against a config's start_urls, and optionally writes the
updated list back with --apply.
- BFS link discovery with configurable depth (default 2), max-pages, rate-limit
- Respects url_patterns.include/exclude from config
- Supports optional nav_seed_urls config field
- Handles both unified (sources array) and legacy flat config formats
- MCP tool sync_config included
- 57 tests (39 unit + 18 E2E with local HTTP server)
- Fixed CI: renamed summary job to "Tests" to match branch protection rule
Closes#306
