jif 421082e79d
Avoid blocking async proxy resolution on the system proxy cache ( #47852 ) ...
## Why
Platform proxy resolution holds the system proxy cache mutex, so checking the cache could block a Tokio worker while another lookup was in progress.
## What changed
Use `try_lock` for cache reads, treating contention as a cache miss so async callers on Windows and macOS wait through the existing asynchronous resolver path.
## Testing
Add a Windows/macOS regression test that verifies resolution yields while the cache is locked and completes after release. Adapt the cached-route test to tolerate concurrent cache writers, and isolate the unavailable-decision cache test from shared cache contention.
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jif
421082e79d