fix: add missing didCompleteReadingStream check and test assertion

src/core/assistant-message/__tests__/presentAssistantMessage-parallel-tools.spec.ts

@@ -237,6 +237,7 @@ describe("presentAssistantMessage - Parallel Tool Execution Timing", () => {
 		// Even if the tool executed, userMessageContentReady should NOT be true
 		// because the stream hasn't completed yet (more content may arrive)
 		// Note: The fix specifically checks both conditions
+		expect(mockTask.userMessageContentReady).toBe(false)
 	})
 
 	it("should handle mcp_tool_use blocks the same as tool_use blocks", async () => {

src/core/assistant-message/presentAssistantMessage.ts

@@ -1029,7 +1029,8 @@ export async function presentAssistantMessage(cline: Task) {
 			// CRITICAL: For parallel tool execution, we must verify all tool results
 			// are collected before signaling ready. Without this check, the message
 			// queue could proceed before all tool_result blocks are in userMessageContent.
-			if (areAllToolResultsCollected(cline)) {
+			// Also verify the stream is complete - more content may still arrive.
+			if (cline.didCompleteReadingStream && areAllToolResultsCollected(cline)) {
 				cline.userMessageContentReady = true // Will allow `pWaitFor` to continue.
 			}
 		}