chore: remove all remaining bun references

Replace all remaining bun references with pnpm or node:
- Remove bun from package.json devEngines
- Update AI SDK installation error message (bun -> pnpm)
- Update example run comment to use node directly
- Update installation instructions in examples (bun -> pnpm)
- Replace bun-types with node types in examples tsconfig.json

Node v24 can run TypeScript files directly without additional tools.

Author: ryoppippi

examples/human-in-the-loop.ts

@@ -3,7 +3,7 @@
  * This allows for more granular control over tool execution and validation.
  *
  * Run this with:
- * bun run examples/human-in-the-loop.ts
+ * node examples/human-in-the-loop.ts
  */
 
 import { assert } from 'node:console';

examples/index.ts

@@ -8,8 +8,8 @@
  * # Using yarn
  * yarn add @stackone/ai
  *
- * # Using bun
- * bun add @stackone/ai
+ * # Using pnpm
+ * pnpm add @stackone/ai
  * ```
  *
  * # Authentication

examples/tsconfig.json

@@ -9,7 +9,7 @@
     "module": "ESNext",
     "moduleResolution": "bundler",
     "lib": ["es2022"],
-    "types": ["bun-types"]
+    "types": ["node"]
   },
   "include": ["**/*.ts"],
   "exclude": ["node_modules"]

package.json

@@ -98,11 +98,6 @@
         "name": "node",
         "version": "^24.11.0",
         "onFail": "download"
-      },
-      {
-        "name": "bun",
-        "version": "^1.3.2",
-        "onFail": "download"
       }
     ]
   }

src/tool.ts

@@ -203,7 +203,7 @@ export class BaseTool {
       jsonSchema = ai.jsonSchema;
     } catch {
       throw new StackOneError(
-        'AI SDK is not installed. Please install it with: npm install ai@4.x|5.x or bun add ai@4.x|5.x'
+        'AI SDK is not installed. Please install it with: npm install ai@4.x|5.x or pnpm add ai@4.x|5.x'
       );
     }