//! Contract tests for the sqlite backend (ADR-009 §backend-contract-tests).
//!
//! Exercises the original eight storage capability traits (`SqlAccess`, `EntityStore`,
//! `GraphStore`, `NoteStore`, `EventStore`, `VectorStore`, `SparseStore`,
//! `TextSearch`) against both in-memory and file-backed SQLite backends.
//! `BlobStore` and `AttachmentStore`, added later, have dedicated conformance
//! suites in `blob_conformance.rs` and `attachment_store.rs`.
//! The harness is structured to become a cross-backend conformance suite when
//! a second backend ships (e.g. `khive-db-postgres`).