[flexdinesh]

• Queue the entire check and pre-push pipeline across linked worktrees using a shared kernel lock. Run phases sequentially, bound Go concurrency, use one Chromium worker, and reuse each invocation's builds. Queued pushes still execute their own complete checks.
• Move 27 browser cases into production React hook/component DOM coverage; remove 9 exhaustive gallery cases and 29 goldens. Keep 103 browser cases for review integration, rendering, geometry, selection, responsive behavior and focus. Development gallery remains.
• Document existing port/runtime isolation and verify two real checkout servers collect independently and stop separately. Application behavior and remote contracts remain unchanged.
• Validate full local checks, actual pre-push race checks, queue failure/cancellation, fixture cleanup and simultaneous Vite servers. Windows/macOS runner paths cross-compiled; runtime validation on Linux. All participating worktrees need the updated runner.