OpenSEO API Server (Cloudflare Workers)

Endpoints:
- GET  /health          - Health check
- GET  /tools           - List available tools
- POST /tools/call      - Call a tool { "name": "tool_name", "arguments": {} }

Tools:
- keyword_research
- serp_validation
- competitor_gap_analysis
- gsc_striking_distance
- compact_keywords_brief
- health_check

All tools implement the Compact Keywords methodology for BOFU landing pages.
No DataForSEO required - uses free Google Ads Keyword Planner + manual SERP checks.