Update documented Node requirement

[vicksiyi]

Summary

• Update the README quick start Node.js requirement to match the current package engine.
• Document the pnpm 10.26.0 requirement in developer setup.

Fixes #4138

Tests

• git diff --check

Notes

• This is a documentation-only change based on the root package.json engines and CI workflow versions.

[gemini-code-assist]

Code Review

This pull request updates the README.md to specify NodeJS 24.x and PNPM 10.26.0 as prerequisites. The feedback suggests specifying >= 10.26.0 for PNPM instead of a fixed version, as the global installation command installs the latest version and a fixed version might mislead developers.

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[gemini-code-assist]

Specifying an exact version like 10.26.0 might lead developers to believe only that exact version is supported, whereas the installation command npm i -g pnpm will install the latest version of PNPM. It is better to specify >= 10.26.0 to allow newer minor/patch versions of PNPM v10.

Suggested change

	- Install [PNPM](https://pnpm.io/installation) 10.26.0
	- Install [PNPM](https://pnpm.io/installation) >= 10.26.0

[vicksiyi]

Updated in the latest commit to document pnpm as >= 10.26.0, matching the engine minimum without implying only one exact patch version is supported.