chore(npm): enforce min version of node and npm for development

[jackw]

What this PR does / why we need it:
This adds a safe guard for local development to the repo by forcing developers to use a version of node and npm for local development that takes advantage of the .npmrc settings allow-git and min-release-age.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

[github-actions]

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✨ This PR can be merged. It will not be considered when calculating future versions of the npm packages and will not appear in the changelogs.

[Copilot]

Pull request overview

This PR tightens local-development safeguards by enforcing minimum Node.js and npm versions (to ensure .npmrc features like allow-git and min-release-age are actually honored) and by enabling strict engine enforcement via npm.

Changes:

• Raise the repository Node.js engine requirement to >=24.15 and add an npm engine requirement >=11.12.
• Enable engine-strict=true in .npmrc so installs fail fast on unsupported Node/npm versions.
• Synchronize the lockfile’s top-level engines metadata with package.json.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
package.json	Updates engines to require Node >=24.15 and npm >=11.12.
package-lock.json	Mirrors the root engines requirements for consistency.
.npmrc	Enables engine-strict to enforce the declared engine constraints during installs.