Highlights:

• Added Connection::stream_closed() to query whether a stream is fully closed.
• Fixed bandwidth arithmetic overflow in recovery and pacing calculations at high bandwidth or over long time periods.
• Fixed PTO retransmission bookkeeping so consecutive PTOs do not duplicate pending lost frames, while preserving overflow protection.
• Increased the PTO backoff cap to allow longer exponential backoff before hitting the cap.
• Fixed HTTP/3 stream cleanup when the local send side finishes before the receive side, avoiding stream state leaks.
• Late PRIORITY_UPDATE frames for closed streams are now ignored instead of recreating HTTP/3 stream state.
• Other bug fixes and performance improvements.

Full changelog at 0.29.0...0.29.1