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Before adding "every N weeks/months" support, found the recurrence window math was independently hand-written in three places (main app's TaskItem.isOccurrence, and two separate widget extensions' countdown progress calculations) with no shared code to keep them in sync. Extracted the math into Shared/RecurrenceRule.swift (pure Foundation, no framework deps) compiled into both the app and widget extension targets via a new project.yml Shared/ source path, and pointed all three call sites at it. Verified every case is identical to prior behavior at interval==1 by compiling and running a standalone test driver directly against the real file with swiftc - 38/38 passing, including Jan-31-monthly and Feb-29-leap-year-yearly edge cases. Groundwork only - no recurrenceInterval field on TaskItem yet, the actual interval feature comes next on top of this. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>