cli: textcheck also checks quoted text in a review against the head

tsk-6s087f17bvd7 open

Decided by the maintainer (req-02c4xjbn1sep).

The incident: a review sent text with two quoted sentences that do not exist at the reviewed head. Neither check caught it:

maity.citecheck checks only review.cites in the JSON, which were correct;
maity.textcheck checks only spans in backticks.

Wanted: textcheck also checks spans in double quotes ("…", “…”) in a review body that read as quotes from a file of the PR. A quote that names a file:line, or sits in a section about one file, must appear verbatim at the reviewed head.

For a miss, maity say --type review_result fails, the way an unknown backtick span does today.
Keep false positives low: ordinary prose in quotes that isn't a quotation (a short word, a term) passes. The contract and the tests state the rule.

Before the review: a test that is red on main with a review body that quotes a sentence absent from the head.