refactor: update testing layers and configurations

- Changed the setup file path in vitest configuration for better organization.
- Refactored the EventBus implementation to streamline event handling.
- Updated various test files to utilize new testing layers for improved clarity and maintainability.
- Introduced new utility layers for file system and persistent service mocks to enhance test reliability.
- Enhanced the platform layer to include necessary services for testing environments.

src/testing/layers/testSessionRepositoryLayer.ts

@@ -0,0 +1,28 @@
+import { Effect, Layer } from "effect";
+import { SessionRepository } from "../../server/core/session/infrastructure/SessionRepository";
+
+export const testSessionRepositoryLayer = (options?: {
+  sessions: Array<{
+    id: string;
+    jsonlFilePath: string;
+    lastModifiedAt: Date;
+    meta: {
+      messageCount: number;
+      firstUserMessage: {
+        kind: "command";
+        commandName: string;
+        commandArgs?: string;
+        commandMessage?: string;
+      } | null;
+    };
+  }>;
+}) => {
+  const { sessions = [] } = options ?? {};
+
+  return Layer.mock(SessionRepository, {
+    getSessions: () => {
+      return Effect.succeed({ sessions });
+    },
+    getSession: () => Effect.fail(new Error("Not implemented in mock")),
+  });
+};