The engine suite's failures are not independent bugs; they are a handful of
systemic drifts where a guard shipped and its fixtures were never updated.
- Required pre-merge gates (FN-158): the door refuses a card whose enabled
optional groups produced no result, and the built-in workflow enables Plan and
Code Review by default. Merge-mechanics fixtures now declare an explicit empty
list, stating the intent they always had. group-merge-coordinator's
"post-Code-Review member" instead gets real PASSING workflowStepResults,
because recording the pass is what that fixture actually means.
- Branch-write provenance: the shared reliability fixture creates a task with a
branch, which now requires an explicit origin. It stands in for an
engine-created branch, so it says so.
- updateTaskAtomic: a production write seam missing from several fake stores,
copied from the faithful fake in merger-ai.test.ts.
- Durable-write inventory: eight unclassified TaskStore surfaces classified,
including the two batched reads this branch added.
- workflow-graph-merge-region-collapse asserted completion-summary AFTER
code-review; the IR wires it before, and production logs agree.
merger-ai.test.ts alone goes 37 -> 0. Engine failures 288 -> ~200.
Also records a first-sighting suite-only flake in the observed register per the
standing rule, rather than quarantining a file with substantial coverage.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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