test(runner): add parallel full-suite runner - #12
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scripts/test.ts runs one fresh process per test file to avoid a Bun event-loop stall, which serializes the 593-file suite to ~40 minutes. Add scripts/test-parallel.ts: same per-file isolation, but up to CCX_TEST_PARALLEL_WORKERS (default min(4, CPU count)) files run concurrently, with the same exclusivity queue as the serial runner. bun run test:parallel finishes the full suite in ~5 minutes. Verified: typecheck, runner unit tests, privacy scan, and two full 593-file parallel runs (one 592/593 with a confirmed flake that passes in isolation and under rerun; one 593/593 clean).
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scripts/test.ts runs one fresh process per test file to avoid a Bun event-loop stall, which serializes the 593-file suite to ~40 minutes. Add scripts/test-parallel.ts: same per-file isolation, but up to CCX_TEST_PARALLEL_WORKERS (default min(4, CPU count)) files run concurrently, with the same exclusivity queue as the serial runner. bun run test:parallel finishes the full suite in ~5 minutes.
Verified: typecheck, runner unit tests, privacy scan, and two full 593-file parallel runs (one 592/593 with a confirmed flake that passes in isolation and under rerun; one 593/593 clean).