ci: enable transport debug logging to diagnose packet delivery issues

Multiple tests are failing intermittently in CI with PUT timeouts,
where the peer reports "Message successfully sent" but the gateway
never receives the message. This appears to be a transport-level issue.

Adding targeted RUST_LOG for peer_connection module to capture:
- Packet send/receive events
- Resend logic
- Connection state changes

This will help diagnose whether packets are being dropped at the
transport layer.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: sanity

.github/workflows/ci.yml

@@ -96,6 +96,8 @@ jobs:
 
     env:
       FREENET_LOG: error
+      # Enable debug logging for transport layer to diagnose packet delivery issues
+      RUST_LOG: "error,freenet::transport::peer_connection=debug,freenet_core::transport::peer_connection=debug"
       CARGO_TARGET_DIR: ${{ github.workspace }}/target
 
     steps: