feat : add stygian guide

lib/events/invalidation.test.ts

@@ -42,6 +42,15 @@ describe("invalidation event envelopes", () => {
     ).toBeNull();
   });
 
+  it("accepts public Stygian invalidations only on the Stygian topic", () => {
+    expect(toInvalidationEvent({
+      topic: "stygian",
+      aggregateId: "5269001",
+      eventType: "stygian.updated",
+      payload: { id: "5269001", version: 4 },
+    })).toEqual({ type: "stygian.updated", id: "5269001", version: 4 });
+  });
+
   it("keeps valid scopes only on authenticated admin events", () => {
     const id = "4afeea7b-6f24-43f3-b747-2db98335e01e";
     expect(toInvalidationEvent({

lib/events/invalidation.ts

@@ -1,6 +1,7 @@
 export const INVALIDATION_TYPES = [
   "directory.updated",
   "page.updated",
+  "stygian.updated",
   "admin.updated",
 ] as const;
 
@@ -59,6 +60,8 @@ export function expectedTopic(event: InvalidationEvent): string {
       return "directory";
     case "page.updated":
       return `page:${event.id}`;
+    case "stygian.updated":
+      return "stygian";
     case "admin.updated":
       return "admin";
   }