maybeObserveWorkflowParity compares the selected workflow graph's routing
against the legacy authoritative run for the same task and records
workflow:parity-observed / -drift audit events (aggregated by
getWorkflowParitySummary). The shadow walks the graph via WorkflowGraphTaskRunner
with no-side-effect seams whose outcomes mirror the legacy task's reality
(execute reached review?, review verdict, merged?), then maps visited seam nodes
to execute/review/merge stages. Hooked in handoffTaskToReview, gated by
workflowInterpreterDualObserve (off by default), wrapped so it never affects the
authoritative handoff. Scope: execute->review->merge routing parity; full
execution-fidelity shadow is future graduation work.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
8e9a3ac4ce