Add WaitReady() channel to RPC server that signals when the socket is
listening and ready to accept connections. Previously daemon startup
waited a fixed 2 seconds which could fail if the server took longer.
Changes:
- Add readyChan to Server struct
- Signal ready after listener bind completes
- Update daemon startup to wait on WaitReady() channel
- Increase timeout to 5s with proper signaling
This fixes multi-repo daemon routing test failures where daemon would
start but not be ready to handle requests within the timeout window.
Amp-Thread-ID: https://ampcode.com/threads/T-675a2db5-b1b3-480d-a108-b003d8139d08
Co-authored-by: Amp <amp@ampcode.com>
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