pr_review.py Does Not Carry a File Table Forward to a Later Round That States No Coverage #2282

Problem

pr_review.py status reports coverage=unstated (exit 30, COVERAGE_IS_UNSTATED) on a pull request whose changed-file set is identical across two Copilot rounds.

The shape:

• Round 1 is a ccr-overview-v2 review on head A. Its file table names exactly the N changed files, so status read coverage=table there.
• A fix lands on the base branch, which moves the head to B. The changed-file set is still the same N files, with the same paths.
• Round 2 is a ccr-overview-v2 review on head B with "Review effort: Lite", "Findings: None", and no file table.

status then prints NO FILE TABLE STANDS IN: no round covering the head carries a file table of its own. That holds although its own message says a round stating nothing "carries the newest round that states some forward, bounded on the change set", and the change set did not change.

Seen on ptr727/HomeAutomation-Config#705 (a develop -> main promotion), rounds 1 and 2.

Expected

A file table from an earlier round carries forward to a later round that states nothing, under the same change-set bound that already applies to a stated coverage line. Otherwise the coverage item can never close on a promotion pull request that took a fix between rounds.