Intent of claudeSdkMessageRouter.ts ×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
- platform/ 3 tests
  - agentHost/ 3 tests
    
    test/ 3 tests
    
    node/ 3 tests
    
    claudeAgent.test|title=ClaudeAgent canonical SDKAssistantMessage with text content does not double-emit signals already produced by stream_event partials (Phase 6.1 / 1 test
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/platform/agentHost/test/node/claudeAgent.test|title=ClaudeAgent canonical SDKAssistantMessage with text content does not double-emit signals already produced by stream_event partials (Phase 6.1 / Cycle F)|occurrence=1 Inherited Cycle F)|occurrence=1
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/platform/agentHost/test/node/claudeAgent.test|title=ClaudeAgent D3: subagent spawn mirrors onto onDidSpawnChat while the subagent signals still flow|occurrence=1 Inherited claudeAgent.ts ×1
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/platform/agentHost/test/node/claudeAgent.test|title=ClaudeAgent canonical SDKAssistantMessage with tool_use content drops silently (partial stream owns ChatToolCallStart)|occurrence=1 Inherited claudeAgent.test|title=ClaudeAgent canonical SDKAssistantMessage with tool_use content drops silently (partial stream owns ChatToolCallStart)|occurrence=1