store: reshuffle stale calendar events during maintenance - #266
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Problem
When a calendar event's dates change, the poller writes the updated event to the new date file but the old copy persists. Compaction only deduplicates within a single file, not across files.
Solution
Add a reshuffle pass in Maintain that loads all calendar date files per calendar ID, keeps the latest version of each event (by Updated timestamp), and rewrites files so events appear only in their correct date range.
Supersedes #263.