Version 0.0.31

• New docs/reference/ pages, each checked against the SDK source:
  init (phone.Init options, precedence and errors, the connection),
  calls (the 22 commands, argument forms, the pre-invite statuses,
  transfers, conferences, recording, screen sharing), events (the
  supported event catalogue with payloads), contacts-and-history,
  messaging, settings (a curated set) and types.
• docs/README.md and README.md link the reference; anything not
  documented is stated to be internal.
• The old generated pages are removed: docs/projects/, DEVELOPER.md,
  TESTING.md, Settings.md and Provisioning.md. CLAUDE.md updated.
• Headless guide: corrected the WebSocketPort default (4443).