fix: restore status idle set in processor error handler to fix unit tests

Author: Ryan Vogel

packages/opencode/src/session/processor.ts

@@ -533,6 +533,7 @@ export const layer: Layer.Layer<
           sessionID: ctx.assistantMessage.sessionID,
           error: ctx.assistantMessage.error,
         })
+        yield* status.set(ctx.sessionID, { type: "idle" })
       })
 
       const process = Effect.fn("SessionProcessor.process")(function* (streamInput: LLM.StreamInput) {