A record-less delivery flag (final_response_sent /
final_content_delivered set with no recorded turn-final payload) was
trusted blindly by delivered_final_matches (None -> legacy trust), so a
first-edit prefix or a truncated finalize suppressed the gateway's
corrective send — silent partial delivery.
- delivered_final_matches: record-less flags are now reconciled against
the FINAL content via has_delivered_text; only the explicitly-marked
ambiguous-timeout path (_delivery_ambiguous) keeps legacy trust.
- _try_fresh_final and the native-streaming optimistic finalize now
record their delivered payload (the last record-less flag setters);
the optimistic record rolls back on definitive dispatch failure.
- Discord adapter: dead-transport send failures (client gone, WS
closed/reset) are classified as send_path_degraded (retryable) so the
delivery-obligation ledger's reconnect sweep replays the stranded
final response instead of losing it until a process restart.
Fixes#95382; closes the #98552 false-positive class.
fd998120c1