Closes #1252
## What changed
- seal each account's bounded completed-Filed receipt collection with authenticated private-state encryption
- transactionally migrate and securely remove legacy plaintext rows while preserving ordering and update semantics
- include the store in shared private-state key rotation with content-free reporting
- document the key requirement and migration behavior
## Verification
- RED observed for encrypted/account-bound storage before implementation
- RED observed for legacy multi-account migration before implementation
- RED observed for rotation coverage before implementation
- `python3 -m pytest tests/test_completed_filed_review_store.py tests/test_rotate_private_state.py -q` → 11 passed
- `python3 -m pytest tests/ -q` → 2369 passed, 12 skipped
- `git diff --check` and `py_compile` pass
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Closes #1252
What changed
Verification
python3 -m pytest tests/test_completed_filed_review_store.py tests/test_rotate_private_state.py -q→ 11 passedpython3 -m pytest tests/ -q→ 2369 passed, 12 skippedgit diff --checkandpy_compilepass