chore: Organize documentation files into subdirectories

Moved markdown files from root to organized structure:
- docs/releases/ - Release notes and checklists
- docs/archive/ - Older documentation
- docs/ - Active documentation

Files moved:
✅ Release docs → docs/releases/
  - RELEASE_NOTES_v1.10.0.md
  - RELEASE_NOTES_v1.7.0.md
  - RELEASE_v1.7.1.md
  - PUBLISH_CHECKLIST_v1.10.0.md
  - PUBLISH_SUMMARY_v1.7.1.md

✅ Archive docs → docs/archive/
  - VALIDATION_v1.7.1.md
  - TOOL-EMULATION-INTEGRATION-ISSUE.md
  - TESTING_QUICK_START.md
  - SUPABASE-INTEGRATION-COMPLETE.md
  - COMPLETION_REPORT_v1.7.1.md
  - .agentdb-instructions.md
  - AGENT-BOOSTER-STATUS.md
  - IMPLEMENTATION_SUMMARY_v1.7.1.md

✅ Active docs → docs/
  - NPX_AGENTDB_SETUP.md
  - PUBLISH_GUIDE.md
  - DOCKER-VERIFICATION.md

Root directory now clean with only:
- README.md
- CHANGELOG.md
- LICENSE

Author: ruvnet