Prepare Release v3.0.0

[github-actions]

This PR is a preview of the release that release-plan has prepared. To release you should just merge this PR 👍

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Release (2025-10-07)

• ember-cli-update 3.0.0 (major)

💥 Breaking Change

• ember-cli-update
  • #1268 Drop support for Node < 20 (@pichfl)

🚀 Enhancement

• ember-cli-update
  • #1280 Warn users trying to upgrade past 6.7.0 - i.e. don't auto upgrade them to Vite (@pichfl)

🏠 Internal

• ember-cli-update
  • #1278 Purge Node 8 related code (@pichfl)
  • #1270 swap to release-plan (@mansona)
  • #1274 update eslint and remove some strange plugins (@mansona)
  • #1271 Use Prettier (@pichfl)
  • #1269 Move to pnpm (@pichfl)
  • #1266 Disable scheduled CI runs (@pichfl)

Committers: 2

• Chris Manson (@mansona)
• Florian Pichler (@pichfl)