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Phase 2: AnalyticsStore (JSON files under Application Support) with immutable frozen daily snapshots + immutable, idempotent, deduped weekly/monthly reports, and 12-month retention pruning. Engine gains completedWeekStartKeys/ completedMonthKeys/missingKeys for idempotent reconciliation selection. AnalyticsStoreTests: 6 XCTest cases. Verified standalone via swiftc — 23- assertion temp-dir harness all pass. Registered files via xcodegen. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>