feat(firmware): ADR-063 mmWave sensor fusion — full implementation
Phase 1-2 of ADR-063:
mmwave_sensor.c/h:
- MR60BHA2 UART parser (60 GHz: HR, BR, presence, distance)
- LD2410 UART parser (24 GHz: presence, distance)
- Auto-detection: probes UART for known frame headers at boot
- Mock generator for QEMU testing (synthetic HR 72±2, BR 16±1)
- Capability flag registration per sensor type
edge_processing.c/h:
- 48-byte fused vitals packet (magic 0xC5110004)
- Kalman-style fusion: mmWave 80% + CSI 20% when both available
- Automatic fallback to CSI-only 32-byte packet when no mmWave
- Dual presence flag (Bit3 = mmwave_present)
main.c:
- mmwave_sensor_init() called at boot with auto-detect
- Status logged in startup banner
Fuzz stubs updated for mmwave_sensor API.
Build verified: QEMU mock build passes.
Co-Authored-By: claude-flow <ruv@ruv.net>
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