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WZP-P2-T2: Adaptive quality switching - QualityAdapter with sliding window of QualityReports - Hysteresis: 3 consecutive reports before switching profiles - Thresholds: loss>15%/rtt>200ms→CATASTROPHIC, loss>5%/rtt>100ms→DEGRADED - CallConfig::from_profile() constructor - 5 unit tests: good/degraded/catastrophic conditions, hysteresis, recovery WZP-P2-T3: AudioWorklet migration (web bridge) - audio-processor.js: WZPCaptureProcessor + WZPPlaybackProcessor - Capture: buffers 128-sample AudioWorklet blocks → 960-sample frames - Playback: ring buffer, Int16→Float32 conversion in worklet - ScriptProcessorNode fallback if AudioWorklet unavailable - Existing UI preserved (connect, room, PTT) WZP-P2-T4: Concurrent session management (relay) - SessionManager tracks active sessions with HashMap - Enforces max_sessions limit from RelayConfig - create_session/remove_session lifecycle - Wired into relay main: session created after auth+handshake, cleaned up after run_participant returns - 7 unit tests: create/remove, max enforced, room tracking, info, expiry 207 tests passing across all crates. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>