* perf(ci): scale Vitest workers with runner class and share serial module cache
Compact node-test jobs pinned OPENCLAW_VITEST_MAX_WORKERS=2 regardless of
runner size, so import-bound suites (30-45s of module-graph import per
file) crawled: runner-cli spent 284s on 5s of tests, commands-1 296s on
10s. With serial plans the budget now scales with the class (6 on 8vcpu,
3 on 4vcpu); timing-sensitive groups (tooling, tui-pty, infra-process)
stay pinned to 2 via plan-level env. Serial bins share one Vitest
fs-module-cache path so later plans reuse the first plan's transforms.
The import-bound commands stripes and security suite move to the 8vcpu
class, and packing hints refresh from serial-run measurements (run
29481835688).
* perf(ci): stripe cli-runner suite and pin media-ui worker budget
The agents-core config runs files serially (fileParallelism false guards
shared module state), so raising the worker budget cannot help its
import-heavy cli-runner suite (~35s module import per file, 213s serial).
Stripe it three ways so bins parallelize the imports instead. media-ui
hosts browser locator tests that timed out at 6 workers on the first
validation run; pin it to the proven 2-worker budget. commands-1's hint
drops to its measured 6-worker runtime.
