mem engine integration — the suite's third column lands, born pinned: StoreFactory implemented for the mem engine (alkstore-mem/tests/contract_suite.rs — a fresh MemStore::new() per open, teardown = drop, unit-struct factory with no external backing) and all 25 rows wired under the current-thread flavor (every test explicitly flavor = "current_thread" — the no-spawn_blocking posture proven by the flavor the column runs under, grep re-verified clean): the 24 engine-shared mechanism rows + mem's new PayloadTooLarge non-occurrence arm row (payload_too_large_never_produced_on_mem — properties.rs, stamped ADR-016 §5 + ADR-024 §3, just-past-2-MiB payload, exported from the suite lib; the SQLite/pg rows untouched — a suite-side class-4 addition, recorded in the task Notes). Column green first run (13 s), zero red rows — no mem defects, no row wobbles, no class-1 escalation owed. Full-surface wiring + crate posture/wasm-identity docs verified as landed by the seam/foundations tasks — zero production code changed. engine-mem.md frontmatter: draft → implementation-complete (stable flip stays with the review gate). Task file: status completed, 6 acceptance boxes ticked, Notes (incl. the wasm on-target scope-out's named collapse condition: a wasm-bindgen-test adapter crate, deliberately not an OQ) + Summary filled. Verified: cargo build; workspace cargo test green (core 25, suite harness 3, mem 100 lib + 25 suite, sqlite 191 + 25, pg 124 + 25 + 9); clippy --all-targets -D warnings clean; cargo fmt --check clean; cargo check --target wasm32-unknown-unknown -p alkstore-mem clean

Cargo.lock

@@ -26,6 +26,7 @@ name = "alkstore-mem"
 version = "0.1.0"
 dependencies = [
  "alkstore",
+ "alkstore-contract-suite",
  "serde_json",
  "tokio",
 ]