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Phase 1 of the analytics system (/goal): the framework-independent analysis engine. Value-type models (MetricDelta, TrendResult, DaySample, WeeklyReport, MonthlyReport, ...) and AnalyticsEngine with documented formulas (volume, %change, consistency, trend) and honest degradation (nil/zero/tiny baseline, new exercise, rest day, outliers via winsorize, unit-dimension compatibility, divide-by-zero). Calendar math takes an injected Calendar (locale/firstWeekday/ timezone/DST-safe). AnalyticsEngineTests: 35 XCTest cases. Independently verified by compiling the engine with swiftc and running a 42-assertion harness — all pass. (Xcode test target not runnable in this env; assertions mirror the XCTest file.) Registered the new files via xcodegen. Logs KC-51 phase-1 progress in ISSUES.md. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>