lock: use std File::lock() on Windows 33cde740 parent 70f07cee

The previous implementation used file creation (`create_new`) as a lock mechanism with polling and a 10-second timeout. This caused issues on Windows where "pending delete" semantics could leave lock files stuck. The new implementation uses std's `File::lock()` which maps to `LockFileEx` on Windows, providing proper OS-level blocking locks that are automatically released if the process crashes. The lock file is deleted in `Drop`. On Windows, all openers use `share_mode` without `FILE_SHARE_DELETE`, so `DeleteFileW` only succeeds when no other process has the file open, avoiding any race condition.

authored by Fedor Sheremetyev

jj / .gitignore

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