Merge remote-tracking branch 'origin/feat/human-readable' into dev

# Conflicts:
#	RSYNC_COMPAT.md
#	src/client/client_send.c
#	tests/test_client_cli.c

src/client/usage.c

@@ -58,6 +58,7 @@ void print_usage(void) {
   printf("  --backup-dir <dir>  Directory for backups (requires --backup)\n");
   printf("  --suffix <str>      Backup suffix (default: ~)\n");
   printf("  --stats             Print transfer statistics at end\n");
+  printf("  -h, --human-readable  Print byte sizes in human-readable form\n");
   printf("  --max-depth <n>     Maximum directory depth (0=unlimited)\n");
   printf("  --log-file <path>   Write log messages to file\n");
   printf("  --partial           Keep partial files on interrupted transfer\n");