Search and TAI are already in the same box and still behave like two products: search finds records, TAI is a fall-through at the bottom of the list. The merger is worth doing for one reason, and it is not tidiness.
A TAI answer's citations are search results. Same records, same references, same row. Once that is true, the two are not two things co-located, they are one thing with two shapes: a list when you know what you want, an answer when you do not. Everything below follows from that.
Drawn fresh from the Untitled kit and the system’s ruled tokens, not restyled from the originals.
A field that guesses wrong is worse than one that asks. The echo chip exists so the reading is visible before Enter is pressed, and ⌘Enter overrides it in one keystroke. The parser is allowed to be confident only about references and prefixes, which are unambiguous by construction; everything else leads with records and offers TAI rather than assuming.
In the field's placeholder, in the empty state's three examples, on the ask row of every result list, and at the foot of every answer. Four honest namings, none of them a button that duplicates a field.