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cc-handguard: Shared Latent Stream Architecture
**Issues**: - ❌ Double battery drain on watch - ❌ Two separate upload streams - ❌ Two device IDs in backend - ❌ Two latent computations for same physical motion - ❌ Wasteful and redundant
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**Issues**: - ❌ Double battery drain on watch - ❌ Two separate upload streams - ❌ Two device IDs in backend - ❌ Two latent computations for same physical motion - ❌ Wasteful and redundant
**Benefits**: - ✅ Single sensor stream (50% battery savings) - ✅ Single upload stream (50% network savings) - ✅ One device_id in backend - ✅ Same z(t) latent state for all policies - ✅ True "latent-first" philosophy - ✅ Can run multiple policy apps simultaneously
**Concept**: EchelonCapture already uploads sensors. Add a local broadcast so HandGuard can subscribe.
**EchelonCapture** (minimal): 1. Add local WebSocket server on port 9001 2. Broadcast latent states locally 3. ~50 lines of code
**HandGuard**: 1. Change `CCLatentSubscriber` to connect to `ws://[ip]:9001` instead of cloud 2. Remove `CCBridgeManager` (no upload needed) 3. Keep `HandGuardPolicy` and intervention logic 4. ~30 lines changed
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