Replace the pre-merge `workflow-step` seam node + `optionalSteps` declaration in
the coding and stepwise-coding built-ins with a `browser-verification`
optional-group (default OFF) whose template runs the browser-verification step.
Enabled tasks run it once pre-merge; disabled tasks bypass it (two-task
divergence engine test; stepwise confirmed run-once post-foreach). Coding is now
interpreter-deferred like stepwise (the group is a branching node). Parity
oracles updated deliberately. Legacy seam-anchor/runWorkflowSteps left for U7.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
main's workflow-graph-executor now collapses the merge-policy region
(merge-gate, branch-group-*, merge-attempt) into a single synthetic
`merge` node. Reconcile the S05 work-item-driver test's visitedNodeIds
assertion to match, and union the `observed` recording-primitive fields
from both branches (executedTasks + merge attempt/run/workflow ids).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Address PR #1578 feedback by failing unwired work item dispatch without a no-op persistence path and forwarding work item attempts into merge primitive context.
Address PR #1578 feedback by deriving merge-gate routing from task/settings auto-merge policy and persisting manual-hold work items as manual-required instead of failed.
