Fix 1: removes a Task-1 forward-reference comment in reflex.rs that
contradicted itself once Task 2 added the imports it claimed were
"intentionally absent."
Fix 2: MockPipe::on_pcm_frame was a no-op, so Test 6 could not
distinguish "delegated to inner" from "dropped on the floor." Add
last_inbound_frame: Option<PcmFrame> capture + assert delegation so
the reflex's inbound-passthrough guarantee is verified, not assumed.
Addresses the two Important findings from the Task 2 review.
Signed-off-by: Aaron D. Lee <himself@adlee.work>
Aaron D. Lee
10c0547431