`pnpm test`'s changed-affected lane ran `vitest run --changed <base>` for the
heavy packages (@fusion/engine, @fusion/dashboard). `vitest --changed` does
unbounded transitive module-graph expansion: one changed hub source file
selects ~8,393 test entries (79s just to list), which at the OOM-pinned
workers=1 exceeds the engine's 15-min VERIFICATION_TIMEOUT_WORKSPACE_MS. The
engine SIGKILLs and restarts the task, producing the observed loop of nine
15-min verification timeouts (~2.8h) on a single task.
Guard the lane with a git-only predictor: when a heavy package has changed
non-test source in its graph, run only the directly-changed test files;
when no test files changed, delegate cross-cutting coverage to the merge gate
(already run in changed mode). Test-only diffs keep normal --changed.
Mirrors the existing reverse-dependent blast cap one level down. No widened
timeouts, retries, or worker bumps. test:full remains the explicit full sweep.
Bounded engine run: 2.79s vs 79s. Regression suite 111/111.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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