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The client now builds ClientDiagnostics snapshots from the connected session, known TAP state, route-pinning status, and tunnel counters. Windows prints one snapshot after TAP and relay-route setup, then repeats snapshots while bridging so frame/datagram counters and drops are visible during manual phase-1 tests. Non-Windows builds print the same relay and QUIC diagnostics with TAP fields marked unknown before waiting for Ctrl-C. TAP IP remains unknown until a later Windows adapter IP inspection slice wires that source of truth. Test Plan: - cargo fmt --check - cargo test -p lanparty-client-win - cargo clippy -p lanparty-client-win --all-targets -- -D warnings - cargo test --workspace - cargo clippy --workspace --all-targets -- -D warnings - git diff --check Refs: PLAN.md