feat(storage): add versioned SQLite migrations - #110
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Closes #80\n\n## Summary\n- adds a sequential SQLite migration registry with immutable checksums and a CI/lint guard\n- validates legacy 3/5/6-table databases, protects newer or unknown schemas with read-only preflight, and creates private online-backup snapshots\n- surfaces schema, integrity, WAL, and backup-maintenance status in Diagnostics without exposing backup paths\n- documents recovery and adds coverage for rollback, WAL, snapshot retention, and schema tampering\n\n## Verification\n- ./scripts/test.sh\n- ./scripts/lint.sh\n- ./scripts/check_licenses.sh\n- ./scripts/check_no_external_network.sh\n- reviewer and security review: no Critical/P1 findings