[itlezy]

Summary

• preserve structured client-UDP parse and routing rejection reasons
• emit terminal receive outcomes for filtered, banned, malformed, unknown, unregistered, unsolicited, disabled, and accepted paths
• centralize all client-UDP socket writes and record correlated attempted/send_succeeded/send_failed/send_cancelled diagnostics
• classify reask, buddy relay, direct callback, and port-test states/phases accurately

Diagnostics contract

• exact outbound bytes appear once on the packet event with outcome: attempted
• lightweight send_outcome events correlate through sendAttemptId without repeating payload bytes
• cancelled in-flight writes report deliveryKnown: false
• exact inbound raw bytes remain present even when the packet cannot be decoded

Validation

• cargo test -p emulebb-ed2k --features packet-diagnostics (1186 passed)
• cargo test -p emulebb-core --features packet-diagnostics (433 unit tests plus all integration suites passed)
• strict cargo clippy -p emulebb-ed2k --all-targets --features packet-diagnostics
• strict cargo clippy -p emulebb-ed2k --all-targets
• cargo fmt --check