fix(embed): add retry with backoff for Windows file lock - #3105
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msvcrt.LK_LOCK blocks until released, but concurrent lock attempts on Windows can fail with EACCES (Errno 36) when two processes race to acquire the profile lock during daemon startup. Add retry loop with exponential backoff (0.1s, 0.2s, 0.4s, 0.8s). After 5 attempts the original OSError is re-raised. Closes vectorize-io#3100
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msvcrt.LK_LOCK blocks until released, but concurrent lock attempts on Windows can fail with EACCES (Errno 36) when two processes race to acquire the profile lock during daemon startup.
Add retry loop with exponential backoff (0.1s, 0.2s, 0.4s, 0.8s). After 5 attempts the original OSError is re-raised.
Closes #3100