docs: pin simplified develop workflow review

docs/workflow/develop-workflow-record.md

@@ -3,8 +3,8 @@
 ## Status
 
 - Status: active
-- Current phase: checkpoint simplification
-- Next safe action: remove the adversarial replacement guard/tests, retain practical cooperative `wx` serialization, then run verification and one final review.
+- Current phase: final simplified review
+- Next safe action: obtain one final independent review of the simplified cooperative contract, then integrate if both axes approve.
 
 ## Request and scope
 
@@ -154,12 +154,17 @@ Before integration, abandon only by preserving evidence and obtaining cleanup ap
 
 ## Review
 
-- Review fixed point: base `b4373113a404bb523bef306a66fb8a22fc706223`, product HEAD `52576c755666f95a40907b0500f095c6d314c346`.
+- Review fixed point: base `b4373113a404bb523bef306a66fb8a22fc706223`, product HEAD `ebbf3c3d19677d161c1fd05229e9faf0852e1ee5`.
 - Specification sources: this record and the accepted skill-led workflow plan.
 - Mutators: parent agent, `checkpoint-implementer`, and `reviewer-profile-implementer`; the worker names identify ambiguous runs because stable child IDs were unavailable.
 - Product status: clean at pin time.
-- Product tree: `e60ba10af999203234edaeea29fc06f93e7b0a39`.
+- Product tree: `a9c951c9ab0349e7e2ea2fbbd5238acf9dc715c9`.
 - Commit list:
+  - ebbf3c3d19677d161c1fd05229e9faf0852e1ee5 refactor(skills): simplify checkpoint locking
+  - c257f31c21de68e5ac26620d05c0740d4e130893 docs: approve checkpoint simplification
+  - 435a12107ff860b01a6cd02097b1abbb043d1b9e docs: approve cooperative checkpoint locks
+  - 26eeab209ed79c8cca5e6f315ad0d63385b81196 docs: record lock remediation rejection
+  - 4178ee48578c9cd1ce8e10777a9411844715d9d5 docs: pin exceptional remediation review
   - 52576c755666f95a40907b0500f095c6d314c346 fix(skills): preserve replaced checkpoint locks
   - 444483ade6be2591bd163f663af54cf343fb58b8 docs: approve focused lock remediation
   - ebab671969afbf0ad7fb22b7a81d1bfa0241a278 docs: record post-rebase review finding
@@ -182,8 +187,8 @@ Before integration, abandon only by preserving evidence and obtaining cleanup ap
   - 6389d22f1505669587d0809c1ed59a040630d3d9 docs: checkpoint develop workflow plan approval
   - fbf1a52b647d3aed7f9b275097384144af5a0eef docs: record develop workflow implementation plan
   - 06e631504cb7df74ded1f4a4651fcf00c86e6ed4 docs: initialize develop workflow record
-- Exact diff command: `git diff --binary --full-index --find-renames b4373113a404bb523bef306a66fb8a22fc706223...52576c755666f95a40907b0500f095c6d314c346 --`.
-- Exact diff SHA-256: `8da3680c6f0a9065ed6f509ba431253d91d89190ce048b4ece2d05e1b2755be0`.
+- Exact diff command: `git diff --binary --full-index --find-renames b4373113a404bb523bef306a66fb8a22fc706223...ebbf3c3d19677d161c1fd05229e9faf0852e1ee5 --`.
+- Exact diff SHA-256: `6ff7dfffd896870e7d4cfb2411b78a0b8fbb6f293e33d9b87801728ad51d2740`.
 - Cycle 1 standards reviewer: `develop-workflow-standards-review` / `precedent-locator` / child `b374d808` / session `01a06cc9-0b63-7d1d-ab7d-47c8286ac5f1`; digest confirmed; CHANGES REQUESTED.
 - Cycle 1 specification reviewer: `develop-workflow-spec-review` / `claim-verifier` / child `8e5f72cd` / session `01a06cc9-4d3f-7a6d-a6ab-37a383956368`; digest confirmed; CHANGES REQUESTED.
 - Before/after reviewer evidence: both reported unchanged branch, HEAD, status, tree, paths, metadata-only delta, product tree, and digest; repository remains clean.
@@ -204,6 +209,9 @@ Before integration, abandon only by preserving evidence and obtaining cleanup ap
 - Remaining medium finding: `stat(lock)` followed by `unlink(lock)` is still a check-then-act race, and `stat` follows symlinks. An external replacement in that gap could be deleted. The regression replaced the lock after closing the original handle and did not model the exact scenario.
 - Approved architecture revision: the user selected a cooperative lock contract. Conforming helper invocations serialize through exclusive `wx` acquisition and never replace an existing lock. Concurrent out-of-protocol pathname mutation is not a supported safety boundary.
 - Simplification decision: the user directed the parent to remove the disproportionate adversarial lock machinery and move on. Keep only practical cooperative lock behavior and its existing concurrency/stale-lock tests.
+- Simplification result: inode/device guards and the adversarial replacement test were removed; the public reference now states the cooperative boundary. Focused tests pass 13/13, link tests pass 8/8, typecheck and the full suite exit 0.
+- Final simplified standards reviewer: pending.
+- Final simplified specification reviewer: pending.
 - This review-brief checkpoint is necessarily a metadata-only commit after the pinned product HEAD because a record cannot contain the digest of bytes that include its own digest. Prove it touches only this record.
 
 ## Integration and rollback
@@ -238,4 +246,5 @@ Rebase the feature branch onto the latest remote/local `main` when available, re
 - Architecture constraint: another conforming helper invocation cannot replace an existing lock because acquisition uses `open(..., "wx")`; the disputed race requires out-of-protocol filesystem mutation. Portable Node filesystem APIs provide no atomic compare-and-delete primitive for defending a path lock against that mutation.
 - Architecture decision: the user approved narrowing the contract to cooperative helper invocations rather than broadening Slice 1–2 with a broker or platform-specific native primitive.
 - Approved follow-up: remove inode/device identity tracking and adversarial replacement tests, retain exclusive `wx` acquisition plus ordinary owned-lock cleanup, reverify once, and complete final review/integration without further hardening scope.
-- Next safe action: commit this simplification gate before dependent production mutation.
+- Simplified product: `ebbf3c3d19677d161c1fd05229e9faf0852e1ee5`, tree `a9c951c9ab0349e7e2ea2fbbd5238acf9dc715c9`, digest `6ff7dfffd896870e7d4cfb2411b78a0b8fbb6f293e33d9b87801728ad51d2740`.
+- Next safe action: commit this metadata-only brief, complete one final review, and integrate on approval.