chore: remove root packageManager nonstandard field

[shivarm]

Description

Validation

Related Issues

closes: ##9004

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• I have run pnpm format to ensure the code follows the style guide.
• I have run pnpm test to check if all tests are passing.
• I have run pnpm build to check if the website builds without errors.
• I've covered new added functionality with unit tests if necessary.

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Project	Deployment	Actions	Updated (UTC)
nodejs-org	Error		Jul 17, 2026 2:23am

[cursor]

PR Summary

Low Risk
Config and CI-only changes with no runtime application logic; ensure local/Corepack workflows still honor devEngines for pnpm version.

Overview
Removes the root packageManager field (pnpm@…) from package.json, so the repo no longer declares the package manager via that Corepack-style property. The pinned pnpm version remains under devEngines.packageManager.

Updates the PNPM updater workflow so automated bumps write devEngines.packageManager.version using the live pnpm --version output instead of parsing the removed packageManager string.

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