The live round trip showed the second examination listing the gate's own
rebuke as source user_2. The rebuke is the gate's turn, not something the
caller gave the model; the second reply is now examined against the
caller's original body (same sources and query as the first). Test pins
it. Elixir gate 15/0.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>