## What changed
- Intercept incoming Opus RTP before the upstream track queue, preserving arrival timestamps without retaining a second queued copy.
- Limit outstanding media to 64 packets and 2 MiB, with a 64 KiB per-packet limit. Keep packet and byte permits until the received data is dropped.
- Reject unexpected payload types, changes in SSRC, oversized packets, and exhausted budgets. Report an error when a packet is more than one second old.
- Start with incoming audio suppressed and connect suppression to `speaker_suppressed`. Discard packets from earlier suppression epochs.
- Drain received packets in the host loop; decoding and playback are not implemented by this change.
## Testing
Add unit coverage for RTP bytes and arrival timestamps, budget ownership, suppression epochs, and invalid or oversized packets. Extend transport tests to verify incoming Opus delivery over UDP and TCP, including simulated packet loss and delayed TCP connection setup.
GitOrigin-RevId: 60237efafdf2acc1c9c4c5d2728e978b8131d9e6
64b482500d