Add layout fixture and tests for page builder agent

AKHIL BABUrequested to merge
issue/canvas-3591457:3591457-issue-branch into 1.x

See #3591457 (closed) for full context.

Testing instructions

  • Add $settings['extension_discovery_scan_tests'] = TRUE; to settings.php if it is not already present.
  • Enable the test module: drush en canvas_ai_agents_test.
  • Go to /admin/config/ai/agents-test/group and click Import AI Agent Test Group.
  • Import modules/canvas_ai/tests/modules/canvas_ai_agents_test/tests/test_drupal_canvas_page_builder_agent_test_group.yaml.
  • Click Run test group and select the AI model to run against.
  • Confirm the 20 tests execute and the group passes (approval threshold is 90%).
  • Clean up: drush pmu canvas_ai_agents_test.

Closes #3591457 (closed)

AI-Generated: Yes (Used Claude Code to author the layout fixtures and page builder test cases).

Edited by AKHIL BABU

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