5ed12f2bf0
- Extract file_save_to_disk() helper (replaces 4x duplicated disk-save boilerplate) - Extract receive_incremental_check() shared helper (deduplicates STATUS_CHECK handling between server.c single-threaded and multiprocessing.c multi-threaded paths) - Break receive_files() into receive_chunk() and receive_manifest() sub-handlers - Add incremental sync test case to test.py - Rebase onto main