fix(ocp): forward all args to cmd_update so multi-flag invocations work

Bug found via runtime smoke test:
  ./ocp update --rollback --list → "no snapshots" (wrong; should list)

Root cause: dispatch was `cmd_update "\${1:-}"` (only first arg). When
user typed `--rollback --list`, cmd_update only received `--rollback`,
the shift left $@ empty, and exec node ... --rollback got no flags.
Other commands using "\${1:-}" don't need multi-arg, but cmd_update now
does (--rollback --list, --rollback --dry-run, --target X --yes, etc.).

Change: dispatch is now `cmd_update "\$@"`. cmd_update internals already
handle multi-arg correctly (\$1 == --check fast path; \$1 == --rollback
shift+forward; otherwise doctor-driven).

Verified:
  ./ocp update --check         → existing behaviour preserved
  ./ocp update --rollback --list → "Found 0 snapshots:" exit 0
  ./ocp update --rollback --dry-run → no-snapshot error exit 1

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ocp

@@ -901,6 +901,6 @@ case "$subcmd" in
   connect)  cmd_connect "$@" ;;
   restart)  cmd_restart "${1:-}" ;;
   doctor)   cmd_doctor "$@" ;;
-  update)   cmd_update "${1:-}" ;;
+  update)   cmd_update "$@" ;;
   *)        echo "Unknown command: $subcmd"; echo ""; cmd_help; exit 1 ;;
 esac