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WZP-P2-T1-S1: Automated drift measurement - New drift_test.rs: DriftTestConfig, DriftResult, run_drift_test() - CLI --drift-test <secs>: sends tone, measures actual vs expected duration - Interpretation tiers: EXCELLENT (<50ms) / GOOD / FAIR / POOR - 2 unit tests: drift math verification, config defaults WZP-P2-T1-S2: Jitter buffer telemetry - JitterStats gains: total_decoded, underruns, overruns, max_depth_seen - JitterBuffer: record_underrun(), record_decode(), reset_stats() - CallDecoder: stats() getter, reset_stats() - JitterTelemetry: periodic tracing::info! logger with configurable interval - 4 unit tests: ingestion tracking, underrun tracking, reset, interval WZP-P2-T1-S3: Parameter sweep - New sweep.rs: SweepConfig, SweepResult, run_local_sweep() - Tests 20 jitter buffer configs (5 target × 4 max depths) locally - CLI --sweep: runs sweep, prints ASCII comparison table - No network needed — pure encoder→decoder pipeline test - 3 unit tests: config defaults, local sweep runs, table formatting 216 tests passing across all crates. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>