Run Windows TypeScript test jobs only on Node.js 22 and split them into three parallel chunks.
Windows TS tests are significantly slower than Linux, and running the full suite on three Node versions spends the extra capacity on duplicate runtime coverage instead of reducing wall clock time. The reusable test workflow now accepts chunk inputs, includes chunk identity in concurrency and artifact names, and keeps Bencher uploads with chunk-specific benchmark names.
Add a CI helper that discovers the selected workspace packages for the same full or affected test scope, shards Jest test files into balanced chunks, runs selected package files with the same Jest Node options and package pretest setup, and writes pnpm-style execution summaries so the pnpm CLI e2e duration extraction still works.
## Summary
Adds CI duration tracking for the `pnpm-ci-performance` Bencher project.
Tracked Rust testbeds and benchmarks:
- `pacquet.ubuntu`, `pacquet.windows`, `pacquet.macos` -> `tests.all`
- `pnpr.ubuntu`, `pnpr.windows`, `pnpr.macos` -> `tests.all`
Tracked pnpm testbeds and benchmarks for full test runs:
- `pnpm.ubuntu.node22`, `pnpm.ubuntu.node24`, `pnpm.ubuntu.node26` -> `tests.all`, `tests.cli`
- `pnpm.windows.node22`, `pnpm.windows.node24`, `pnpm.windows.node26` -> `tests.all`, `tests.cli`
The test workflows produce Bencher-compatible JSON artifacts without receiving `BENCHER_API_TOKEN`. A separate `workflow_run` workflow downloads those artifacts only for same-repository runs, validates their metadata, and uploads from trusted workflow code using the existing `BENCHER_API_TOKEN` secret. The pnpm CLI e2e duration is extracted from `pnpm run --report-summary` output during the same full-test execution, so the CLI e2e suite is not run a second time.
