test(hooks): remove unsafe test assertions

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/hooks/session-recovery/storage/readers-from-sdk.test.ts

@@ -13,7 +13,7 @@ function createMockClient(handlers: {
   messages?: (sessionID: string) => unknown[]
   message?: (sessionID: string, messageID: string) => unknown
 }) {
-  return {
+  return testCoerce({
     session: {
       messages: async (opts: { path: { id: string } }) => {
         if (handlers.messages) {
@@ -28,7 +28,7 @@ function createMockClient(handlers: {
         throw new Error("not implemented")
       },
     },
-  } as unknown
+  })
 }
 
 describe("session-recovery storage SDK readers", () => {