ci: use staged npm publishing

[JoviDeCroock]

Summary

• Switches the trusted npm publish path to pnpm stage publish.
• Uses pnpm 11.3.0 and npm 11.15.0 in the release workflow.
• Preserves Changesets tag/GitHub release creation by emitting package tags from the staging helper.

Verification

• node --check .github/scripts/stage-packages.mjs
• Workflow YAML parsed locally.

[changeset-bot]

⚠️ No Changeset found

Latest commit: dae3104

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR