refactor(coding-agent): reorganized test files to proper test directory structure

- Moved test files from src/core to test/core directory.
- Moved test files from src/core/tools to test/tools directory.
- Moved test files from src/discovery to test/discovery directory.
- Updated import paths to reflect new test file locations.

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

@@ -0,0 +1,42 @@
+import { describe, expect, it } from "bun:test";
+import { executePythonWithKernel, type PythonKernelExecutor } from "../../src/core/python-executor";
+import type { KernelDisplayOutput, KernelExecuteOptions, KernelExecuteResult } from "../../src/core/python-kernel";
+
+class FakeKernel implements PythonKernelExecutor {
+	private result: KernelExecuteResult;
+	private onExecute: (options?: KernelExecuteOptions) => Promise<void> | void;
+
+	constructor(result: KernelExecuteResult, onExecute: (options?: KernelExecuteOptions) => Promise<void> | void) {
+		this.result = result;
+		this.onExecute = onExecute;
+	}
+
+	async execute(_code: string, options?: KernelExecuteOptions): Promise<KernelExecuteResult> {
+		await this.onExecute(options);
+		return this.result;
+	}
+}
+
+describe("executePythonWithKernel display outputs", () => {
+	it("aggregates display outputs in order", async () => {
+		const outputs: KernelDisplayOutput[] = [
+			{ type: "json", data: { foo: "bar" } },
+			{ type: "image", data: "abc", mimeType: "image/png" },
+		];
+
+		const kernel = new FakeKernel(
+			{ status: "ok", cancelled: false, timedOut: false, stdinRequested: false },
+			async (options) => {
+				if (!options?.onDisplay) return;
+				for (const output of outputs) {
+					await options.onDisplay(output);
+				}
+			},
+		);
+
+		const result = await executePythonWithKernel(kernel, "print('hi')");
+
+		expect(result.exitCode).toBe(0);
+		expect(result.displayOutputs).toEqual(outputs);
+	});
+});