feat: added IPython-backed Python tool with streaming output and Jupyter integration

- Added IPython-backed Python tool with streaming output and image/JSON rendering.
- Implemented Jupyter kernel gateway integration with WebSocket communication.
- Added Python prelude with 30+ shell-like utility functions for file operations.
- Migrated environment variables from PI_ to OMP_ prefix with automatic migration.
- Added streaming output system with automatic spill-to-disk for large outputs.
- Reorganized settings interface into behavior, tools, display, voice, status, lsp, and exa tabs.

packages/coding-agent/src/core/python-executor-mapping.test.ts

@@ -0,0 +1,41 @@
+import { describe, expect, it } from "bun:test";
+import { executePythonWithKernel, type PythonKernelExecutor } from "./python-executor";
+import type { KernelExecuteOptions, KernelExecuteResult } from "./python-kernel";
+
+class FakeKernel implements PythonKernelExecutor {
+	constructor(
+		private result: KernelExecuteResult,
+		private onExecute: (options?: KernelExecuteOptions) => void = () => {},
+	) {}
+
+	async execute(_code: string, options?: KernelExecuteOptions): Promise<KernelExecuteResult> {
+		this.onExecute(options);
+		return this.result;
+	}
+}
+
+describe("executePythonWithKernel mapping", () => {
+	it("annotates timeout cancellations", async () => {
+		const kernel = new FakeKernel({ status: "ok", cancelled: true, timedOut: true, stdinRequested: false });
+		const result = await executePythonWithKernel(kernel, "sleep(10)", { timeout: 5000 });
+
+		expect(result.cancelled).toBe(true);
+		expect(result.exitCode).toBeUndefined();
+		expect(result.output).toContain("Command timed out after 5 seconds");
+	});
+
+	it("maps error status to non-zero exit code", async () => {
+		const kernel = new FakeKernel(
+			{ status: "error", cancelled: false, timedOut: false, stdinRequested: false },
+			(options) => {
+				options?.onChunk?.("traceback\n");
+			},
+		);
+
+		const result = await executePythonWithKernel(kernel, "1 / 0");
+
+		expect(result.exitCode).toBe(1);
+		expect(result.output).toContain("traceback");
+		expect(result.stdinRequested).toBe(false);
+	});
+});