docs(plan): implementation plan for CycloneStore split (Step 4)
13 tasks implementing the spec: pre-flight baseline, atomic-move of store.py into store/__init__.py, 10 module extractions (exceptions, records, orm_builders, ui, write, batches, claim_detail, acks, backups, inbox, providers), and final verification + single atomic commit. Working tree stays dirty through Tasks 1-11; final commit happens at end of Task 12 per the spec's single-atomic-commit requirement. Each task ends with a focused test-suite verification (not full baseline — that's Task 12 Step 1's job) so regressions are caught early.
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