02ceb6e64c
Phase 2 of tab completion: semantic completion for session IDs. Features: - /resume <TAB> lists all available sessions from .g3/sessions/ - /resume abc<TAB> filters to sessions starting with 'abc' - Gracefully returns empty if .g3/sessions/ doesn't exist Implementation: - Added list_sessions() helper method to G3Helper - Added Case 4 in complete() for /resume command - Updated module docs to reflect new capability Tests: - test_resume_completion_lists_sessions - verifies listing and filtering - test_resume_completion_graceful_no_panic - verifies no crash without sessions dir