Fix: make integration test failures block the pipeline

Removed continue-on-error: true from the pytest step so test failures
actually fail the workflow. Previously, 5/7 tests could fail and the
pipeline would still report success and proceed to auto-merge.

Author: James N.

.github/workflows/integration-tests.yml

@@ -64,7 +64,6 @@ jobs:
         run: |
           cd tests
           pytest -v -m "integration" --tb=short
-        continue-on-error: true  # Report results but don't fail the workflow
         env:
           BACKEND_API_ENDPOINT: ${{ inputs.backend_endpoint }}
           MCP_ENDPOINT: ${{ inputs.mcp_endpoint }}