[itlezy]

Summary

• preserve stable peer TCP trace/state context in unified diag_event_v2 records
• retire the final Rust peer TCP legacy packet/handshake side-file writer
• classify packet, state, and obfuscation-handshake events directly in the internal capture record
• remove stale legacy schema documentation while retaining the bundle exclusion regression fixture

Harness dependency

• follows emulebb-build-tests#27, which migrated active peer diagnostics consumers to unified events and rejects legacy packet side files

Validation

• cargo fmt --all -- --check
• cargo test -p emulebb-ed2k --features packet-diagnostics --locked (1190 passed)
• cargo test -p emulebb-ed2k --locked (1182 passed)
• python tools\\rust_quality_gate.py quick

Closes #164