Third review round follow-through: enqueue_tx stamp source, sweep_expired handle form, with_tx signature, and B-block ambiguity pins

docs/architecture/decisions/021-tx-reads-and-value-shape-fixes.md

@@ -12,6 +12,22 @@ corrections to accepted decisions found by the review — ADR-019 §1's
 tx-methods claim and ADR-019 §3's `Job` field list — corrected inline
 there, per this repo's convention that wrong statements in decisions
 are fixed where they stand, not left for readers to discover.)
+*(Follow-through 2026-10-07, same round, second session: the review's
+remaining ambiguities — all decidable from decided material — were
+closed by single-sentence/annotation edits against the already-decided
+ADRs and specs, recorded in the annotations' own text rather than a
+new ADR: A4 (`enqueue_tx` stamps the derived engine defaults —
+annotated onto ADR-020 §3), A5 (stale `sweep_expired(queue)` shapes
+aligned to ADR-019 §1's handle form in core-contract.md and queues.md),
+`retry -> bool` + the refused-retry residue and the `fail(None)`
+default string (ADR-019 §3), the one-shot/repeatable split restated
+(core-contract), `ack_batch`'s per-id predicate (ADR-010 §1), opts
+field types/defaults (core-contract, honker-rs parity), the
+consumer-local non-empty rules (ADR-008 §4), the `with_tx` signature
+(ADR-007), the `PayloadTooLarge` measurement basis (ADR-008 §5),
+per-stream offset-sequence equivalence (ADR-015 §4), the
+`recv_timeout` timeout arm and `EventReceiver`'s no-`recv_timeout`
+posture (ADR-008 §3/§8).)*
 
 ## Context