Clean up comments in Task.ts

Removed outdated comment regarding model's preserveReasoning flag.

Author: daniel-lxs

src/core/task/Task.ts

@@ -3437,8 +3437,6 @@ export class Task extends EventEmitter<TaskEvents> implements TaskLike {
 					// Check if the model's preserveReasoning flag is set
 					// If true, include the reasoning block in API requests
 					// If false/undefined, strip it out (stored for history only, not sent back to API)
-					// Note: Use api.getModel() directly instead of cachedStreamingModel since
-					// buildCleanConversationHistory is called before streaming starts
 					const shouldPreserveForApi = this.api.getModel().info.preserveReasoning === true
 					let assistantContent: Anthropic.Messages.MessageParam["content"]