docs: add detailed itinerary refactor implementation plan

11 bite-sized TDD tasks to replace anchor-based positioning with
simple (day, sortOrder) model. Includes migration path for CloudKit.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Trey t
2026-01-17 09:12:16 -06:00
parent bd1e24181f
commit 59ba2c6965

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