Document the code-review P1 as a logic-errors learning: a per-task graph
toggle (enabledWorkflowSteps, keyed by optional-group node id) collided with
the legacy step-template namespace and was silently remapped by the store
resolver, bypassing an enabled group. Cross-references the per-task-override
blast-radius cousins as the id-namespace-collision variant of that class.
Seeds an "Optional step group" entry in CONCEPTS.md.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>