agentHost: Add Copilot runtime regression E2E coverage - #334818

PR classified as team-member.

✅ Head commit 7e8b4d8 is signed by roblourens with trusted key SHA256:roLWOAd4DY8UlCXthcUaIrEPdgK9nNzs/ixa+eugGJE — approval requirement reduced from 2 to 1.

⚠️ Collaborator approvals: 0/1.

Needs 1 more collaborator approval to merge.

✅ No newly added runnable binary files.

✅ Engineering system changes are allowed.

• build/azure-pipelines/product-build.yml
• package.json
• remote/package.json

The PR author is a current VS Code team member.