02619cca5c
- Remove dead socket.c/socket.h (accumulated duplicate symbols) - Extract compression.h/c (data_compress/decompress from data.c) - Extract io.h/c (low-level I/O from protocol.c) - Extract metadata.h/c (unified metadata wire format from file.c, chunk.c, utils.c) - Split client.c into client_cli.c (CLI parsing) + client_send.c (send logic) - Move receiver pipeline threads from server.c to multiprocessing.c - Move to_disk/file_restore_metadata from utils.c to file.c/metadata.c - Fix const qualifiers on to_disk and str_dup signatures - Suppress chown unused-result warning