- handler.channel_open_direct_tcpip now proxies non-wraith channels via
connect_outbound+proxy_channel instead of dropping them
- ClientSession.run() spawns reconnect monitor that detects handle closure,
reconnects with exponential backoff (1s/2s/4s/8s/16s/30s cap),
and re-registers remote port forwards
- Remove server-side logging of tunnel destinations (ADR-006 compliance)
- Remove debug-level logging of proxy targets in channel_proxy