[itlezy]

Scope

• learn modern peer UDP version from mule HELLO instead of waiting for optional EMULEINFO
• preserve protocol source state across the stock 29-minute UDP reask interval
• infer completeness for one-part sources when stock omits FILESTATUS
• expose an exact queued-source reask control only in diagnostics builds
• order receive evidence before asynchronous reply evidence and emit causal application state

These fixes were discovered by the bilateral deterministic parity campaign, not by log-string comparison.

Evidence

Receipt rust-mfc-client-udp-v4-20261102t123752z proves Rust and MFC emitted byte-identical UDP v4 request c5907a95c62c0a406c3fd822ed7de2429f8f0100000100 and ACK c59100000100 bytes in both directions and applied the same part status, complete-source count, and queue rank.

Validation

• Rust package gate: 1,238 tests passed
• diagnostics client build: green, zero warnings (20261102T122933Z-build-clients)
• source revision pinned by the receipt: 938bce6cf18971e900cbb78a2c92f2dc585e1a3f
• full harness suite: 3,271 passed, 1 expected skip, 1 intentional deselection
• coordinated MFC oracle PR: [RUST-CI-031] Expose deterministic client UDP v4 evidence emulebb#186
• coordinated evidence/catalog PR: [RUST-CI-031] Admit deterministic client UDP v4 parity emulebb-build-tests#87

This is one bounded slice of #164 and does not claim the other eight client-UDP variants.