Barrett Ruth 4e9ce2bc8a feat(store): add snapshot() and atomic json write ... Problem: the single-level undo used shallow references so mutations during diff.apply() corrupted the saved state. JSON writes were also non-atomic, risking partial writes on crash. Solution: add M.snapshot() which deep-copies active tasks (including _extra). Change M.save() to write a .tmp file then rename atomically.		2026-02-24 18:44:13 -05:00
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pending	feat(store): add snapshot() and atomic json write	2026-02-24 18:44:13 -05:00