Planning-lane cross-review permission fallback Use this when a planning-only overnight worker can successfully revise plans but cannot run the repo's real cross-provider review machinery. Problem pattern Observed in the 2026-04-21 CI batch for workspace-hub issues #2441, #2443, and #2444: - the worker could revise files - the worker could write - the worker could post GitHub comments - but permission policy blocked That means the worker can produce review-shaped artifacts, but not actual Codex/Gemini/Codex cross-provider evidence. Required response 1. Do NOT pretend the fallback artifacts are…