fix: await SessionRevert.cleanup for shell (#10669)

packages/opencode/src/session/prompt.ts

@@ -1349,7 +1349,7 @@ NOTE: At any point in time through this workflow you should feel free to ask the
 
     const session = await Session.get(input.sessionID)
     if (session.revert) {
-      SessionRevert.cleanup(session)
+      await SessionRevert.cleanup(session)
     }
     const agent = await Agent.get(input.agent)
     const model = input.model ?? agent.model ?? (await lastModel(input.sessionID))