* feat: skip lockfile writes for legacy packageManager field
When pnpm is pinned via the `packageManager` field in `package.json`, the
resolved pnpm integrity info is no longer written to `pnpm-lock.yaml`
unless the pinned version is pnpm v12 or newer. `devEngines.packageManager`
still populates and reuses `packageManagerDependencies` as before. This
keeps the v10 -> v11 transition quiet by avoiding unrelated lockfile
churn for projects that pin pnpm the legacy way.
* fix: address Copilot review and CI failure
- Update `configurationalDependencies.test.ts` to assert the new behavior:
the `packageManager` field no longer writes pnpm resolution info to the
env lockfile while config dependencies still are.
- Fast-path in `switchCliVersion`: when the lockfile is not persisted and
the running CLI already matches `pm.version`, skip store access and
integrity resolution entirely.
- Clarify the `resolvePackageManagerIntegrities` docstring to describe
the conditional `save` behavior.
* test: add unit tests for shouldPersistLockfile
Extract the decision logic for persisting pnpm resolution info to the env
lockfile into a dedicated helper so the branches — devEngines source,
legacy `packageManager` field with v11 or older, v12+, and invalid/missing
version — can all be covered without needing an actual pnpm v12 tarball
on the registry.
Zoltan Kochan
ea2a7fb244