Focus24 Kernel

In dependency order, after the scorer:

• Circadian model, scoring/circadianPerformance.js, 289 lines
• Neck strain: %MVC, the Frey-Law three-compartment model, RULA, pose/neckStrainTracker.js, 713 lines
• rPPG heart rate and respiration, physiology/*.js, 1 356 lines
• Face touch and sip detection, pose/*.js, 528 lines
• Guidance: advice rules, negative factors, deep work, lib/*.js, 644 lines
• Calculators and composites, metrics/calculator/*.js, 682 lines
• Pattern detector: k-means++, anomaly, trend, lagged correlation, 699 lines, behind the alloc feature

Each lands as its own TDD cycle against golden traces, filling in the metric folder that already holds its definition.