feat(signal): implement Phase 5 Reliability & Intelligence
Phase 5 deliverables:
- Diurnal adaptive baseline (24-slot hourly vectors, 7-day learning, crossfade, confidence indicator)
- Stationary person detection (breathing band 0.1-0.5 Hz, long-dwell logic with health gating)
- Ambient confidence score (per-link health: SNR, phase stability, packet rate, drift; composite gauge)
- Link weather diagnostics (root-cause suggestions, weekly trends, repositioning advice)
- Baseline persistence (SQLite storage for EMA and diurnal baselines)
Key components:
- signal/diurnal.go: 24-hour baseline slots with cosine crossfade
- signal/breathing.go: 4th-order Butterworth bandpass filter for breathing detection
- signal/ambient.go: Per-link health scoring with weighted composite
- signal/persist.go: SQLite persistence for baselines
- signal/healthpersist.go: Health log aggregation for weekly trends
- diagnostics/linkweather.go: 5 diagnostic rules with actionable advice
- diagnostics/reposition.go: GDOP-based repositioning target computation
- fleet/healer.go: Self-healing fleet with role re-optimization
- dashboard/js/app.js: Quality gauge UI with health polling
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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