vpdotnet / wgnet / 22199014283

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Improve test coverage from 67.4% to 84.5%

Add handler_test.go (peer management, maintenance, cookie/DoS flow,
utility tests), replay_test.go (sliding window edge cases), and new
tests in server_test.go and multihandler_test.go (ConnectWith, Send
multi-handler, type-2/3 routing, Maintenance).

Fix bug in MultiHandler.routeByReceiverIndex: type-2 response messages
have the receiver index at data[8:12], not data[4:8] (which is the
sender index). Type-3 cookie replies correctly use data[4:8].

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

5 of 10 new or added lines in 1 file covered. (50.0%)

1340 of 1611 relevant lines covered (83.18%)

38.0 hits per line