• Add concurrency to all workflows - Cancel in-progress runs when new commits arrive
• Protect test summaries from cancellation - Prevent false failures when workflows are cancelled
• Add merge queue failure notifications - Post PR comment with failed job details when ejected from queue
• Add Lemonade Server smoke test - Quick validation before full integration tests

Changes

Concurrency

All workflows now include:

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

Cancellation Protection

Test summary jobs use robust if conditions to handle cancellation gracefully:

if: >-
  ${{ always() && !cancelled() &&
      needs.job1.result != 'cancelled' &&
      needs.job2.result != 'cancelled' }}

Merge Queue Notification

New merge-queue-notify.yml workflow:

• Triggers on workflow completion for merge queue runs
• Extracts PR number from merge queue branch name
• Posts comment with failed jobs and direct links to logs

Lemonade Smoke Test

New test_lemonade_server.yml workflow:

• Validates health endpoint returns context_size
• Tests basic completion endpoint
• Runs before Windows/Linux integration tests

Reusable Start-Lemonade Action

New .github/actions/start-lemonade/ composite action:

• Cross-platform (Windows/Linux)
• Configurable model, port, context size
• Sets UTF-8 encoding automatically

Test Plan

• Verify concurrency cancels old runs on new push

• Verify test summaries pass when some jobs are skipped

• Trigger merge queue failure and verify PR comment appears

• Verify Lemonade smoke test runs before integration tests

• Closes Integrate concurrency in CI/CD #261