Client relay I/O now shares atomic tunnel counters across cloned
ClientRelayIo handles and the owning ClientSession. The counters cover
successful Ethernet frame rx/tx, relay datagram rx/tx, and dropped or
malformed frames so client diagnostics have the traffic totals called
out in PLAN.md.
The counters live in client-core because that crate owns relay datagram
classification and Ethernet payload validation. The Windows TAP runner can
later sample this snapshot without duplicating protocol decisions.
Test Plan:
- cargo fmt --check
- cargo test -p lanparty-client-core
- cargo clippy -p lanparty-client-core --all-targets -- -D warnings
- cargo test --workspace
- cargo clippy --workspace --all-targets -- -D warnings
- git diff --check
Refs: PLAN.md
ddidderr
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