Intent of runSubagentTool.test|title=RunSubagentTool model fallback behavior uses main model when subagent has no model configured|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
- workbench/ 3 tests
  - contrib/ 3 tests
    
    chat/ 3 tests
    
    test/ 3 tests
    
    common/ 3 tests
    
    tools/ 3 tests
    
    builtinTools/ 3 tests
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/workbench/contrib/chat/test/common/tools/builtinTools/runSubagentTool.test|title=RunSubagentTool model fallback behavior skips Copilot fallback models when main model is BYOK and inherits the main model|occurrence=1 Inherited runSubagentTool.test|title=RunSubagentTool model fallback behavior skips Copilot fallback models when main model is BYOK and inherits the main model|occurrence=1
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/workbench/contrib/chat/test/common/tools/builtinTools/runSubagentTool.test|title=RunSubagentTool model fallback behavior uses main model when subagent has no model configured|occurrence=1 Introduced here
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/workbench/contrib/chat/test/common/tools/builtinTools/runSubagentTool.test|title=RunSubagentTool model fallback behavior uses the Copilot fallback model when no main model is set|occurrence=1 Inherited runSubagentTool.test|title=RunSubagentTool model fallback behavior uses the Copilot fallback model when no main model is set|occurrence=1