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MotionMix Unified Director — Agent Handoff

// After: adaptive — performer phase OR metronome fallback poseBarCounter += 1 let echelonBarFired = echelonBridge.shouldFireBar() let fixedBarFired = poseBarCounter % 30 == 0 guard (echelonBarFired || fixedBarFired), let hub else { return } ```

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# MotionMix Unified Director — Agent Handoff > Generated 2026-04-04 | Cross-session synthesis of Echelon work + Multicam Unified Director evolution The previous session completed 8 layers of foundational Echelon work. Here is what now exists and its exact state: ### Layer 1 — FFI Thread Safety ✅ - All brain-side FFI calls serialized onto `@MainActor` in `EchelonBridge.swift` - Sensor frames queued via `NSLock` into `pendingSensorFrames`, drained in `step()` on MainActor - Audio handle (`MotionSynth`) stays on audio render thread — safe to access concurrently - False comment removed ### Layer 2 — Canonical 104D State Contract ✅ `getDynamics104()` now returns the full vector: ### Layer 3 — Backend Selector ✅ `echelon_create_with_backend(config, backend, weights_path)` now available: - backend=0 → SimpleLatentUpdater (default) - backend=1 → LearnedLatentUpdater - backend=2 → DellLatentUpdater

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