[itlezy]

Summary

• mirror each retained eD2K client UDP packet into the bounded diag_event_v2 stream
• define the distinct ed2k_client_udp family with exact raw and decoded payload bytes
• derive receive deobfuscation input from the actual remote endpoint, fixing lost obfuscated receive diagnostics
• preserve the legacy side writer unchanged until client-UDP terminal outcomes are complete and all four unbounded writers can be retired

Validation

• cargo fmt --all -- --check
• cargo test -p emulebb-ed2k --locked --features packet-diagnostics (1,181 passed before the isolated sender-IP fix)
• focused obfuscated receive and foreign-datagram tests after the sender-IP fix
• strict default cargo clippy -p emulebb-ed2k --all-targets --locked
• strict diagnostic cargo clippy -p emulebb-ed2k --all-targets --locked --features packet-diagnostics
• git diff --check