Add test coverage for new BLEInterface cleanup functionality:
- _cleanup_pending_identity_connections: timeout handling for non-Reticulum devices
- _process_pending_detaches: delayed interface detachment with grace period
- _validate_spawned_interfaces: orphaned interface cleanup
- Multi-address disconnect handling (keeping interface alive for MAC rotation)
- Thread-safe _spawn_peer_interface with locking
- Central disconnect callback with address fallback
These tests cover the 195 lines of new code in BLEInterface.py to improve
patch coverage for PR #35.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
