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/services/ingestion/src/migrations/001_initial_schema.ts

@@ -46,7 +46,7 @@ const field = {
   }),
 
   json: (name: string): FieldDef => ({
-    name, type: 'json', required: false, options: {},
+    name, type: 'json', required: false, options: { maxSize: 2097152 },
   }),
 
   date: (name: string): FieldDef => ({
@@ -146,18 +146,17 @@ async function run(): Promise<void> {
   const usersCol = await pb.collections.getFirstListItem<CollectionModel>('name="users"');
   ids.set('users', usersCol.id);
 
-  const hasRole = usersCol.schema.some(s => s.name === 'role');
-  if (!hasRole) {
+  const existingFieldNames = new Set(usersCol.schema.map((s: { name: string }) => s.name));
+  const fieldsToAdd: FieldDef[] = [];
+  if (!existingFieldNames.has('role')) fieldsToAdd.push(field.select('role', ['admin', 'employee'], true));
+  if (!existingFieldNames.has('display_name')) fieldsToAdd.push(field.text('display_name'));
+
+  if (fieldsToAdd.length > 0) {
     const updateBody: Record<string, unknown> = {
-      schema: [
-        ...usersCol.schema,
-        field.select('role', ['admin', 'employee'], true),
-        field.text('display_name'),
-        field.file('avatar', ['image/jpeg', 'image/png', 'image/webp']),
-      ],
+      schema: [...usersCol.schema, ...fieldsToAdd],
     };
     await pb.collections.update(usersCol.id, updateBody);
-    console.log('  extended with role, display_name, avatar');
+    console.log(`  extended with: ${fieldsToAdd.map((f: FieldDef) => f.name).join(', ')}`);
   } else {
     console.log('  skip   users (already extended)');
   }