fix(core): misc fixes

packages/actor/src/actor-prompt-builder.ts

@@ -106,7 +106,9 @@ Guidelines:
     if (this.bufferRepo) {
       try {
         recentEntries = this.bufferRepo.listForOwner(entity.id);
-      } catch {}
+      } catch {
+        // bufferRepo may not be available
+      }
     }
 
     // --- Recent memory ---

packages/actor/tests/actor-prompt-builder.test.ts

@@ -1,6 +1,6 @@
 import { describe, it, expect, beforeEach, afterEach } from "vitest";
 import Database from "better-sqlite3";
-import { WorldState, Entity, AttributeVisibility } from "@omnia/core";
+import { WorldState, Entity } from "@omnia/core";
 import { BufferRepository, LedgerRepository } from "@omnia/memory";
 import { ActorPromptBuilder } from "../src/actor-prompt-builder";