bug(rpc): pending RPC calls hang forever when target Worker disconnects #34981

Bug

When a Worker crashes or emits "error" or "messageerror", all pending Rpc.call() promises never settle. The pending Map leaks the resolve callbacks.

Steps to reproduce

1. Create a Worker and call Rpc.client(worker)
2. Make an RPC call via client.call("method", {})
3. Kill/terminate the Worker before it responds
4. The returned Promise hangs indefinitely

Expected

The Promise should reject with an error indicating the target disconnected.

Actual

The Promise never settles. Memory leak in pending Map.

Environment

All versions using @/util/rpc from packages/opencode/src/util/rpc.ts