feat: protocol improvements — live trunking, mini-frames, noise suppression, adaptive jitter

T6 wiring: Trunking in relay hot path
- TrunkedForwarder wraps transport with TrunkBatcher
- run_participant uses 5ms flush timer when trunking enabled
- send_trunk/recv_trunk on QuinnTransport
- --trunking flag on relay config
- 2 new tests: forwarder batches, auto-flush on full

T7 wiring: Mini-frames in encoder/decoder
- MediaPacket::encode_compact/decode_compact with MiniFrameContext
- CallEncoder sends mini-headers for consecutive frames (full every 50th)
- CallDecoder auto-detects full vs mini on receive
- mini_frames_enabled in CallConfig (default true)
- 3 new tests: encode/decode sequence, periodic full, disabled mode

Noise suppression (nnnoiseless/RNNoise)
- NoiseSupressor in wzp-codec: pure Rust ML-based noise removal
- Processes 960-sample frames as two 480-sample halves
- Integrated in CallEncoder before silence detection
- noise_suppression in CallConfig (default true)
- 4 new tests: creation, processing, SNR improvement, passthrough

T1-S4: Adaptive playout delay
- AdaptivePlayoutDelay: EMA-based jitter tracking (NetEq-inspired)
- Computes target_delay from observed inter-arrival jitter
- JitterBuffer::new_adaptive() uses adaptive delay
- adaptive_jitter in CallConfig (default true)
- 5 new tests: stable, jitter increase, recovery, clamping, estimate

272 tests passing across all crates.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/wzp-relay/src/main.rs

@@ -64,6 +64,9 @@ fn parse_args() -> RelayConfig {
             "--probe-mesh" => {
                 config.probe_mesh = true;
             }
+            "--trunking" => {
+                config.trunking_enabled = true;
+            }
             "--mesh-status" => {
                 // Print mesh table from a fresh registry and exit.
                 // In practice this is useful after the relay has been running;
@@ -84,6 +87,7 @@ fn parse_args() -> RelayConfig {
                 eprintln!("  --probe <addr>         Peer relay to probe for health monitoring (repeatable).");
                 eprintln!("  --probe-mesh           Enable mesh mode (mark config flag, probes all --probe targets).");
                 eprintln!("  --mesh-status          Print mesh health table and exit (diagnostic).");
+                eprintln!("  --trunking             Enable trunk batching for outgoing media in room mode.");
                 eprintln!();
                 eprintln!("Room mode (default):");
                 eprintln!("  Clients join rooms by name. Packets forwarded to all others (SFU).");
@@ -239,6 +243,7 @@ async fn main() -> anyhow::Result<()> {
         let auth_url = config.auth_url.clone();
         let relay_seed_bytes = relay_seed.0;
         let metrics = metrics.clone();
+        let trunking_enabled = config.trunking_enabled;
 
         tokio::spawn(async move {
             let addr = connection.remote_address();
@@ -423,6 +428,7 @@ async fn main() -> anyhow::Result<()> {
                     transport.clone(),
                     metrics.clone(),
                     &session_id_str,
+                    trunking_enabled,
                 ).await;
 
                 // Participant disconnected — clean up per-session metrics