* feat: read pnpm version from devEngines.packageManager field
When no version is specified in the action config or the packageManager
field of package.json, fall back to devEngines.packageManager.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* feat: skip self-update for devEngines.packageManager and add CI tests
pnpm auto-switches to the right version when devEngines.packageManager
is set, so self-update is unnecessary. This also enables range support
(e.g. ">=9.15.0") which self-update doesn't handle.
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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