Add Wormhole auto-kill so Interface 5 can be claimed

Cable autorun holds IF5; kill on launch/connect and via GUI button/CLI.

Co-authored-by: Cursor <cursoragent@cursor.com>

juc500_xfer/usb_link.py

@@ -203,7 +203,7 @@ def _claim_failure_message(ifnum: int, exc: BaseException) -> str:
             f"{base}\n\n"
             "Windows가 Interface 5를 다른 드라이버(공식 Wormhole 등)로 붙잡고 있습니다.\n"
             "아래를 순서대로 하세요:\n"
-            "1) 작업 관리자에서 Wormhole / SmartDataLink / j5create 관련 프로그램 모두 종료\n"
+            "1) GUI의 'Wormhole 종료' 버튼 또는 `python -m juc500_xfer kill-wormhole`\n"
             "2) Zadig(https://zadig.akeo.ie/) 실행 (관리자)\n"
             "3) Options → List All Devices\n"
             "4) 목록에서 'Smart Data Link (Interface 5)' 또는 InstanceId에 MI_05 가 있는 항목 선택\n"
@@ -464,6 +464,24 @@ class Juc500Link:
         try:
             usb.util.claim_interface(self._dev, ifnum)
         except usb.core.USBError as exc:
+            # Official Wormhole often holds IF5 — kill and retry once.
+            if _is_access_denied(exc) and ifnum == IF_VENDOR:
+                try:
+                    from .wormhole_kill import kill_wormhole_processes
+
+                    kill_wormhole_processes(force=True)
+                    time.sleep(0.6)
+                    if not _IS_WIN:
+                        try:
+                            if self._dev.is_kernel_driver_active(ifnum):
+                                self._dev.detach_kernel_driver(ifnum)
+                        except (NotImplementedError, usb.core.USBError):
+                            pass
+                    usb.util.claim_interface(self._dev, ifnum)
+                    self._claimed.append(ifnum)
+                    return
+                except Exception:
+                    pass
             if required:
                 raise RuntimeError(_claim_failure_message(ifnum, exc)) from exc
             return