U6: delete the built-in WORKFLOW_STEP_TEMPLATES catalog + its materializer
(getBuiltInWorkflowTemplate/ensureWorkflowStepForTemplate/toBuiltInWorkflowStep);
inline the browser-verification + code-review name/prompt/toolMode/gateMode into
their optional-group IR builders (node bytes unchanged); simplify
resolveEnabledWorkflowSteps to an identity-stable pass-through (no materialization,
so the optionalGroupIdSet collision guard is no longer needed). Plugin-contributed
step templates are kept as the editor palette.
U5: remove the legacy /api/workflow-steps REST surface (GET/POST/PATCH/DELETE +
/refine + /workflow-step-templates/:id/create), the dead client fns, and the
Settings management UI; GET /api/workflow-step-templates now serves plugin
templates only. The create-time optional-step toggles remain.
Scope: the workflow_steps store CRUD + table are intentionally KEPT — still consumed
by the engine (merger/recovery) and needed by U7's migration; their removal + the
table drop land in U7.
Plan U5 + U6.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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