feat(coding-agent/core): changed timeout units to milliseconds in Python tool

- Changed timeout parameter from seconds to milliseconds in Python tool.
- Updated PythonExecutorOptions interface to use timeoutMs instead of timeout.
- Improved streaming output handling by removing async queuing and simplifying buffer management.
- Updated default timeout to 30000ms for Python tool execution.

packages/coding-agent/test/core/python-executor-timeout.test.ts

@@ -26,7 +26,7 @@ describe("executePythonWithKernel cancellation", () => {
 			},
 		);
 
-		const result = await executePythonWithKernel(kernel, "sleep(10)", { timeout: 5000 });
+		const result = await executePythonWithKernel(kernel, "sleep(10)", { timeoutMs: 5000 });
 
 		expect(result.cancelled).toBe(true);
 		expect(result.exitCode).toBeUndefined();