decompose review-004 recorded findings: 15 disposition tasks + the review-004-fixes gate (sqlite seam panic-safety, watcher-death subscribe + initial-stat, bridge alignment, scheduler classification, substrate SAFETY delta; pg forwarder hardening + diagnosability, BIGINT stamp decision + fix, log-facade decision; core offset pin + Display forging, mem doc notes, pg identifier note, tokio dev-dep normalization) — taskgraph validate green (95)

tasks/core-pin-offset-initial-value.md

@@ -0,0 +1,65 @@
+---
+id: core-pin-offset-initial-value
+name: Verify and pin EventReceiver::offset()'s pre-yield value (review 004 item 12)
+status: pending
+depends_on: []
+scope: narrow
+risk: low
+impact: project
+level: implementation
+tags: [review-004-fixes, core, contract, verification]
+---
+
+## Description
+
+The named gap from `docs/reviews/004-pre-release-general-review.md`
+§"Findings recorded, not fixed" item 12: `EventReceiver::offset()`
+pins the *post-yield* value only; the *pre-yield* return (the seeded
+checkpoint vs 0) is unpinned in core-contract.md's receiver text.
+
+Two steps, in order:
+
+1. **Verify the three engines' pre-yield values empirically** — the
+   review explicitly did not verify them this session. Probe per
+   engine: a fresh consumer's `offset()` before any yield, and a
+   consumer with a saved checkpoint's `offset()` before any yield.
+   The contract suite is the natural home (a three-way equivalence
+   leg, stamped per `version_stamp.rs` convention); per-engine tests
+   are the acceptable alternative if the suite's harness shape fights
+   the probe — implementer's choice, recorded.
+2. **Pin the semantics in the contract text** — core-contract.md's
+   `EventReceiver::offset()` paragraph gains the pre-yield return
+   (dated annotation). Doc-only.
+
+**If the engines diverge**: do NOT paper over with a doc pin — record
+the divergence precisely (which engine, which arm) and raise with the
+user; a contract-observable divergence is a fix-the-code-or-amend
+conversation, not a doc edit.
+
+## Acceptance Criteria
+
+- [ ] The three engines' pre-yield `offset()` values verified equal by
+      live runs (the probe/leg recorded; green on all three columns —
+      pg against the harness server)
+- [ ] core-contract.md's `EventReceiver::offset()` text pins the
+      pre-yield return with a dated annotation
+- [ ] If divergent instead: the divergence recorded and raised with
+      the user (this AC replaces the doc pin, not supplements it)
+- [ ] Doc gate green; any new suite leg green on all three columns
+
+## References
+
+- docs/reviews/004-pre-release-general-review.md §"Findings recorded,
+  not fixed" item 12 (the named gap)
+- docs/architecture/core-contract.md (the receiver text, the
+  verification backlog)
+- alkstore-contract-suite (the three-column harness; the
+  version-stamp convention)
+
+## Notes
+
+> To be filled by implementation agent
+
+## Summary
+
+> To be filled on completion