Enable tool-based message generation in chat-stream-provider and add BasicValueTool and WeatherTool.

Updated dependencies to latest versions in `bun.lock`. Modified development script in `package.json` to include watch mode.

packages/ai/src/tools/basic.ts

@@ -0,0 +1,41 @@
+// tools/basicValue.ts
+export interface BasicValueResult {
+  value: string;
+}
+
+export const BasicValueTool = {
+  name: 'basicValue',
+  type: 'function',
+  description: 'Returns a basic value (timestamp-based) for testing',
+  parameters: {
+    type: 'object',
+    properties: {},
+    required: [],
+  },
+  function: async (): Promise<BasicValueResult> => {
+    // generate something obviously basic
+    const basic = `tool-called-${Date.now()}`;
+    console.log('[BasicValueTool] returning:', basic);
+    return { value: basic };
+  },
+};
+export const WeatherTool = {
+  name: 'get_weather',
+  type: 'function',
+  description: 'Get current temperature for a given location.',
+  parameters: {
+    type: 'object',
+    properties: {
+      location: {
+        type: 'string',
+        description: 'City and country e.g. Bogotá, Colombia',
+      },
+    },
+    required: ['location'],
+    additionalProperties: false,
+  },
+  function: async (params: { location: string }) => {
+    console.log('[WeatherTool] Getting weather for:', params.location);
+    return { temperature: '25°C' };
+  },
+};