refactor(agent-core-v2): drop the unused AgentPhase status union - #3760

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: thehanimo/pr-title-checker@v1.4.3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/