Increase #records retrievalble from courses namespace and change prompt to better handle invalid courses

Author: kevin-lann

course-matrix/backend/src/constants/constants.ts

@@ -46,7 +46,7 @@ export const TEST_DATE_NOW = new Date(2025, 4, 14, 8, 45, 1);
 
 // Set minimum results wanted for a similarity search on the associated namespace.
 export const namespaceToMinResults = new Map();
-namespaceToMinResults.set("courses_v3", 10);
+namespaceToMinResults.set("courses_v3", 16);
 namespaceToMinResults.set("offerings", 16); // Typically, more offering info is wanted.
 namespaceToMinResults.set("prerequisites", 5);
 namespaceToMinResults.set("corequisites", 5);

course-matrix/backend/src/controllers/aiController.ts

@@ -443,7 +443,8 @@ export const chat = asyncHandler(async (req: Request, res: Response) => {
           - If information is missing from the context but likely exists, try to use info from web to answer. If still not able to form a decent response, acknowledge the limitation
           - For unrelated questions, politely explain that you're specialized in UTSC academic information
           - If a user prompt appears like a task that requires timetable operations (like create, read, update, delete a user's timetable) BUT the user prompt doesn't start with prefix "/timetable" then remind user to use "/timetable" in front of their prompt to access these capabilities
-      
+          - If a user asks about a course that you do not know of, acknowledge this.
+
           ## Available Knowledge
           ${
             context === "[No context provided]"