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E2E crypto handshake: - Client/relay handshake via SignalMessage (CallOffer/CallAnswer) - X25519 ephemeral key exchange with Ed25519 identity signatures - Integration tests proving bidirectional encrypt/decrypt Codec2 integration: - Pure Rust codec2 crate (v0.3) — no C bindings needed - MODE_3200 (160 samples/20ms, 8 bytes) and MODE_1200 (320 samples/40ms, 6 bytes) - 11 new tests including encode/decode roundtrip and adaptive switching Relay forwarding: - Bidirectional client → remote forwarding with pipeline processing - CLI args: --listen, --remote - Periodic stats logging, clean shutdown via tokio::select! Benchmark tool (wzp-bench): - Codec roundtrip, FEC recovery, crypto throughput, full pipeline benchmarks - Sine wave PCM generator for realistic testing Audio I/O (cpal): - AudioCapture (microphone) and AudioPlayback (speakers) at 48kHz mono - CLI --live mode: mic → encode → send / recv → decode → speakers 120 tests passing, 0 failures. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>