## Summary
- Switches the engine-core Vitest project from thread workers to fork
workers to avoid the Node 24/macOS libuv kqueue SIGABRT while preserving
real failure semantics.
- Adds a small policy regression test covering the gate pool, warning
behavior, and engine-core allow-list expectations.
## Test Plan
- node --test scripts/__tests__/engine-vitest-gate-policy.test.mjs
- corepack pnpm --filter @fusion/engine test:core
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## Summary by CodeRabbit
* **Bug Fixes**
* Improved reliability of the engine’s Vitest test execution on newer
macOS/Node setups by scoping a safer worker strategy to the core
merge-gate suite.
* Prevented configuration and gate-script changes that could otherwise
break consistent test behavior.
* **Tests**
* Added automated “gate policy” checks to validate Vitest configuration
constraints and ensure core/test-gate scripts run with the expected
command and allow-listed test patterns.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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