--- type: Changed pr: 4676 --- Internal (ADR-4629 section 8.1, epic #4629 child C1): introduce the `StateWriteIntent` type, extending `StateTransaction`, and a `readModifyWriteStateMd` opaque-transform recognition capability in the STATE.md write-path drift guard. This is the foundation for verified, bounded STATE.md writes. No user-facing behavior changes and no caller is migrated (that is Phase 2 and later).