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d69b95dbbc
- Guard against `getProcess` returning null in the macOS FFI path (`proc_pidpath` can fail with EPERM or for an already-exited PID). Stop unwrapping with `!` and only populate the ProcessInfoCache on success; the previous code threw NullThrownError there, which the outer try/catch silently swallowed and prevented caching of valid later results. - Add a 5-second negative cache for ports whose owner can't be resolved (typical for short-lived clients that exited before we scanned). Without it every such request triggered a full PID list rescan, defeating the point of the pid cache for the failure path. - Add a debug-only assert that the host is little-endian. The libproc parsing reads `(int)htons(port)` by treating the low two bytes as a big-endian uint16, which requires a little-endian host. All shipping macOS hardware satisfies this; the assert fails loudly if the assumption is ever broken (stripped from release builds). Re-verified on macOS 26.4: 500 concurrent curl through the proxy, single ProxyPin process throughout, 9099 freed immediately on exit.