Add specifications for gamification, generation, and R42 chat services

- Introduced gamification service spec detailing responsibilities, API surface, XP calculation, levels, streaks, badges, milestone cards, and heatmap data.
- Added generation service spec outlining the process for generating micro learning content, including API endpoints, AI call configuration, prompt strategies, and error handling.
- Created R42 chat service spec covering chatbot interactions, retrieval pipeline, prompt construction, response generation, and stateless design principles.

app/pb_migrations/1779544736_created_topics.js

@@ -0,0 +1,55 @@
+/// <reference path="../pb_data/types.d.ts" />
+migrate((db) => {
+  const collection = new Collection({
+    "id": "1ixwljuo2xqxcqj",
+    "created": "2026-05-23 13:58:56.098Z",
+    "updated": "2026-05-23 13:58:56.098Z",
+    "name": "topics",
+    "type": "base",
+    "system": false,
+    "schema": [
+      {
+        "system": false,
+        "id": "kkjhfk5h",
+        "name": "theme",
+        "type": "relation",
+        "required": true,
+        "presentable": false,
+        "unique": false,
+        "options": {
+          "collectionId": "bm117d8jhn68xqr",
+          "cascadeDelete": false,
+          "minSelect": null,
+          "maxSelect": 1,
+          "displayFields": null
+        }
+      },
+      {
+        "system": false,
+        "id": "ygnod47v",
+        "name": "body",
+        "type": "editor",
+        "required": false,
+        "presentable": false,
+        "unique": false,
+        "options": {
+          "convertUrls": false
+        }
+      }
+    ],
+    "indexes": [],
+    "listRule": null,
+    "viewRule": null,
+    "createRule": null,
+    "updateRule": null,
+    "deleteRule": null,
+    "options": {}
+  });
+
+  return Dao(db).saveCollection(collection);
+}, (db) => {
+  const dao = new Dao(db);
+  const collection = dao.findCollectionByNameOrId("1ixwljuo2xqxcqj");
+
+  return dao.deleteCollection(collection);
+})