fix: prevent permanent hang and singleton deadlock#2
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Replace CreateFileMapping singleton guard with named mutex, add timeout to event wait, and reset stale event state. 1. Mutex (Local\IMControlMutex) replaces file mapping as singleton guard — auto-released when process dies, no residual blocking. 2. WaitForSingleObject timeout: INFINITE → 10000ms; on timeout returns ERR_SEND_MESSAGE_TIMEOUT_TIMED_OUT instead of hanging. 3. ResetEvent after CreateEventA to clear leftover signaled state from residual hook DLLs in target processes. 4. Bump version to 0.5.1.
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Replace CreateFileMapping singleton guard with named mutex, use per-process unique event names, and add timeout to event wait.