build(deps): migrated to Bun runtime and simplified stream handling

- Migrated from Node.js to Bun runtime by replacing @types/node with @types/bun and bun-types dependencies.
- Downgraded @types/diff from ^8.0.0 to ^7.0.2 in coding-agent package.
- Updated tsconfig.base.json to include DOM.AsyncIterable in lib configuration for async iterable DOM API support.
- Simplified stream handling in update-cli.ts by removing Readable.fromWeb() conversions and using response.body directly with pipeline().
- Simplified TextDecoderStream instantiation in stream.ts to use default parameters instead of explicit UTF-8 encoding configuration.
- Added defensive null/undefined handling in agent-loop.ts result assignment using nullish coalescing operator.

packages/agent/src/agent-loop.ts

@@ -503,7 +503,7 @@ async function executeToolCalls(
 	for (const record of records) {
 		const toolCall = record.toolCall;
 		const shouldSkip = record.skipped || record.result === undefined;
-		const result = shouldSkip ? createSkippedToolResult() : record.result;
+		const result = shouldSkip ? createSkippedToolResult() : (record.result ?? createSkippedToolResult());
 		const isError = shouldSkip ? true : record.isError;
 		if (!record.started) {
 			stream.push({

packages/coding-agent/package.json

@@ -104,10 +104,11 @@
 		"zod": "^4.3.6"
 	},
 	"devDependencies": {
-		"@types/diff": "^8.0.0",
+		"@types/diff": "^7.0.2",
 		"@types/jsdom": "27.0.0",
+		"bun-types": "^1.3.8",
 		"@types/ms": "^2.1.0",
-		"@types/node": "^25.2.0",
+		"@types/bun": "^1.3.8",
 		"ms": "^2.1.3"
 	},
 	"keywords": [

packages/coding-agent/src/cli/update-cli.ts

@@ -7,7 +7,6 @@
 import { execSync, spawnSync } from "node:child_process";
 import * as fs from "node:fs";
 import * as path from "node:path";
-import { Readable } from "node:stream";
 import { pipeline } from "node:stream/promises";
 import { isEnoent } from "@oh-my-pi/pi-utils";
 import chalk from "chalk";
@@ -200,8 +199,7 @@ async function updateViaBinary(release: ReleaseInfo): Promise<void> {
 	}
 
 	const fileStream = fs.createWriteStream(tempPath, { mode: 0o755 });
-	const nodeStream = Readable.fromWeb(response.body as import("stream/web").ReadableStream);
-	await pipeline(nodeStream, fileStream);
+	await pipeline(response.body, fileStream);
 
 	// Download native addon
 	console.log(chalk.dim(`Downloading ${nativeAddonName}...`));
@@ -212,8 +210,7 @@ async function updateViaBinary(release: ReleaseInfo): Promise<void> {
 	}
 
 	const nativeFileStream = fs.createWriteStream(nativeTempPath, { mode: 0o755 });
-	const nativeNodeStream = Readable.fromWeb(nativeResponse.body as import("stream/web").ReadableStream);
-	await pipeline(nativeNodeStream, nativeFileStream);
+	await pipeline(nativeResponse.body, nativeFileStream);
 
 	// Replace current binary
 	console.log(chalk.dim("Installing update..."));

packages/utils/src/stream.ts

@@ -1,5 +1,3 @@
-import { TextDecoderStream } from "node:stream/web";
-
 /**
  * Sanitize binary output for display/storage.
  * Removes characters that crash string-width or cause display issues:
@@ -81,7 +79,7 @@ export function createSanitizerStream(): TransformStream<string, string> {
  * Create a transform stream that decodes text.
  */
 export function createTextDecoderStream(): TransformStream<Uint8Array, string> {
-	return new TextDecoderStream("utf-8", { ignoreBOM: true }) as TransformStream<Uint8Array, string>;
+	return new TextDecoderStream() as TransformStream<Uint8Array, string>;
 }
 
 /**

tsconfig.base.json

@@ -2,7 +2,7 @@
 	"compilerOptions": {
 		"target": "ES2024",
 		"module": "ESNext",
-		"lib": ["ES2024"],
+		"lib": ["ES2024", "DOM.AsyncIterable"],
 		"strict": true,
 		"esModuleInterop": true,
 		"skipLibCheck": true,