- README.md: version badge 2.2.0 → 2.2.1, release link, CI section
  mentions .golangci.yml lint config
- docs/README.md: add v2.2.1 release entry with full change summary;
  update Latest Release link; v2.2.0 moved to history

v2.2.1 highlights:
  - Zero golangci-lint issues across entire codebase
  - .golangci.yml (v2 format) with errcheck/staticcheck/unused config
  - Code quality: tagged switches, fmt.Fprintf, lowercase error strings
  - Dead code cleanup: orchestrator.go sync.Mutex + containsWebPort()
  - CI fix: reporter HTML template now tracked in git