v0.5.0

• Aligned fast raw-QUIC and HTTP/3 client ownership so high-connection client lanes now reuse one worker and one local UDP port per bind family instead of scaling setup work with session count.
• Reduced runtimeMode: 'auto' fallback churn by caching fast-path unavailability for the life of a process, so restricted Linux environments stop re-probing io_uring on every new connection attempt.
• Added a repeatable cross-platform performance workflow with persisted host and Docker artifacts, Linux/macOS profiler wrappers, and attribution harnesses for quiche-direct, loopback, and Node mock-transport analysis.
• Fixed the raw-QUIC timeout/reap regression captured in the committed quic-bottlenecks artifact set, returning the affected 1000-stream lane from 950/1000 completions with timeouts to 1000/1000 with lower tail latency.
• Kept one important limit explicit: like-for-like HTTP/3 lanes still trail raw QUIC controls, so this release should be read as transport hardening and observability work rather than as proof that higher-layer overhead is gone.