release-crate-docs: crate docs final pass — doc gate green with -D warnings posture recorded in AGENTS.md, warn(missing_docs) adopted on the four published crates (audit probe 0; Error enum+fields, sqlite substrate fuzz-surface fns filled), accuracy pass fixed core drifts (trim_to wake nuance, ADR-023 §2 domain rules + shared paragraph, QueueOpts gloss, MemStore::new exception) and engine postures (eleven-vs-ten tx-method count, spawn_blocking rationale via sync substrate, one-host cross-process honesty element), spec-side aligned (pg locks family + row-backed wording, mem clock-accessor home), two boundary-wording dispositions recorded for release-contract-window-close (try_recv arms, 8000-byte <= reading), queue round-trip doctest landed in alkstore-mem crate docs; task -> completed with Notes + Summary

alkstore-sqlite/src/tx.rs

@@ -1,6 +1,6 @@
 //! The transactional seam's SQLite arm — `begin_tx`, the
 //! [`SqliteTxHandle`] (the writer-slot lease, ADR-007), and all eleven
-//! `*_tx` methods (`sqlite-engine-seam-tx`).
+//! transaction-handle methods (ten `*_tx` ops plus `commit`) (`sqlite-engine-seam-tx`).
 //!
 //! `begin_tx` acquires the writer slot and opens `BEGIN IMMEDIATE` on
 //! the acquired connection; the handle owns connection + slot. Every