docs: remove obsolete integration directory

  - Delete docs/integration/ directory with historical working files
  - Remove s5js_README.md (obsolete draft, main README is current)
  - Remove PROJECT-STATUS.md (outdated Fabstir status from Aug 2025)
  - Remove DEPLOY-NOW.md (Fabstir-specific deployment guide)
  - Remove REAL-S5-SERVER-README.md (historical server setup notes)

  These files were working documents from August integration work and are
  no longer relevant. Main README.md is comprehensive and up-to-date.
  Files preserved in git history if needed for reference.

Author: Developer