Two engine merger tests created mkdtempSync workspaces directly in tmpdir() under the tracked `fusion-test-` prefix; under full-suite concurrent load the post-run check-test-isolation flagged them as leaks. Route both (`merger-no-op-fix-finalize.test.ts`, `merger-verification-fix-already-on-main.test.ts`) through FUSION_TEST_WORKER_ROOT like sibling merger tests so they nest inside the already-tracked worker root. Bump engine vitest subprocess guard from 60s to 120s and testTimeout to 30s — plain git commands (branch -d, worktree remove) queued behind system contention during `pnpm -r --workspace-concurrency=2` runs were timing out. The guard only fires on hangs, so healthy tests pay nothing. Also bundles in-progress dashboard mobile-breakpoint regex/CSS test updates and docs index additions. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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