PLAN.md describes relay frame logs with separate forwarded, dropped, filtered,
and rate-limited actions. The relay had the shared `Filtered` action in its log
vocabulary, but safety-policy rejects were still reported as generic drops.
Classify forged client source MACs and L2 safety-filter matches as filtered
forwarding decisions. Malformed frames and unknown destinations remain drops,
while rate limits continue to use the rate-limited action.
Document the distinction in the relay README section.
Test Plan:
- cargo fmt --check
- cargo test -p lanparty-relay
- cargo test --workspace
- cargo clippy --workspace --all-targets -- -D warnings
- git diff --check
Refs: PLAN.md
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