8f4ea62ae7
Phase 1 — Bugs: - receive_data: fix unsigned long long vs size_t mismatch - chunk_deserialize: add NULL check in multiprocessing.c and server.c - file_content_to_buffer: add missing fclose on error path - send_files_multithreaded: propagate sender thread result - server: add SIGPIPE handler - to_disk: check fwrite return value - scanner: use S_ISDIR instead of !S_ISREG - scanner: free cur_path before early return Phase 2 — Cleanup: - Remove unused chunk_decompress function - Remove unused array_list_clear function - Remove unused num_connections config field - Remove duplicate FILE_METADATA_WIRE_SIZE macro - Update tests for removed APIs