Intent of yaml.test|title=YAML Parser parseMarkdown no frontmatter returns undefined header and full input as body|occurrence=1

All 3 exact tests in this concept. Every test is marked by where it enters the hierarchy.

mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/ 3 tests
- base/ 1 test
  - test/ 1 test
    
    common/ 1 test
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/base/test/common/yaml.test|title=YAML Parser parseMarkdown no frontmatter returns undefined header and full input as body|occurrence=1 Introduced here
- platform/ 2 tests
  - agentHost/ 2 tests
    
    test/ 2 tests
    
    node/ 2 tests
    
    customizations/ 1 test
    
    scan/ 1 test
    
    claudeRuleScan.test|title=claudeRuleScan .claude/ 1 test
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/platform/agentHost/test/node/customizations/scan/claudeRuleScan.test|title=claudeRuleScan .claude/rules files are path-scoped when `paths` frontmatter is present, else always-on|occurrence=1 Inherited rules files are path-scoped when `paths` frontmatter is present, else always-on|occurrence=1
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/platform/agentHost/test/node/copilotAgent.test|title=CopilotAgent createSession activeClient eager-claim getSessionCustomizations coalesces burst watcher changes into one discovered refresh publish|occurrence=1 Inherited copilotAgent.test|title=CopilotAgent createSession activeClient eager-claim getSessionCustomizations coalesces burst watcher changes into one discovered refresh publish|occurrence=1