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WZP-P2-T6: Trunking - TrunkFrame/TrunkEntry: pack N session packets into one datagram - Wire format: [count:u16][session_id:2][len:u16][payload]... - TrunkBatcher: batches by count (10) or bytes (1200), flushes on limit - 5 tests: encode/decode roundtrip, empty frame, batcher fill/flush, byte limit WZP-P2-T7: Mini-frames - MiniHeader: 4-byte delta header (timestamp_delta + payload_len) - FRAME_TYPE_FULL (0x00) / FRAME_TYPE_MINI (0x01) discriminator - MiniFrameContext: expands mini-headers to full by tracking baseline - Saves 8 bytes per packet (5 vs 13 bytes with type prefix) - 5 tests: encode/decode, wire size, context expand, no baseline, size comparison WZP-P2-T8: Silence suppression - SilenceDetector: RMS-based detection with hangover (5 frames = 100ms) - ComfortNoise: low-level random noise generator - CodecId::ComfortNoise variant for CN packets - CallEncoder: suppresses silent frames, sends 1-byte CN every 200ms - CallDecoder: generates comfort noise on CN packets - ~50% bandwidth savings in typical conversations - 6 tests: silence/speech detection, hangover, CN generation, RMS math, suppression WZP-P2-T9: Call control signals - SignalMessage: Hold, Unhold, Mute, Unmute, Transfer, TransferAck - CallSignalType mapping in featherchat.rs for all new variants - 4 serde roundtrip tests + signal type mapping tests 255 tests passing across all crates. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>