fix(receipt): --check-prose skips the required Review-loop exception line (GST-977)

write --review-loop-exception requires the PR body to carry the exception line word for word, and read --check-prose read the owner reason in it as counter claims ("outside 1 and 2 skip detector" as 2 skip against 70, gstack-evals #139). The prose check now skips the line that matches the receipt exception exactly, as it skips the rendered Approvals block.

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

docs/ship-policy.md

@@ -1222,7 +1222,11 @@ block `gstack-approvals` renders (its heading, the Date | Asked | Exact words
 table and the `Source: gstack-approvals record` line) quotes the owner's
 words, not this PR's numbers, so it is skipped: "one Step 11 pass" in that table
 is not a `pass` claim. Text you write under the heading after that block, and
-a `## Approvals` example inside a code fence, are still checked. Data PRs (evals,
+a `## Approvals` example inside a code fence, are still checked. The
+`Review-loop exception: …` line the receipt's own exception requires is
+skipped the same way (GST-977): it quotes the owner's reason, so "outside 1 and
+2 skip detector" is not a `2 skip` claim. Only a line that matches the rendered
+line exactly is skipped; the same words anywhere else are still checked. Data PRs (evals,
 measurements, sweeps) run it before READY so the body's numbers are the run's.
 
 <a id="review-scope"></a>

docs/troubleshooting.md

@@ -5766,7 +5766,8 @@ body that names a counter the receipt records (`passes=3` against
 against `gate.passed: 41`) with a different value. The receipt is written from
 the run; the prose was typed, so a reader of the body would learn a number the
 run did not produce. The `PROSE:` line names each field with both values. The
-`## Approvals` table `gstack-approvals` renders is never read as a claim.
+`## Approvals` table `gstack-approvals` renders, and the `Review-loop exception: …`
+line the receipt's exception requires, are never read as claims.
 
 **Fix.** Correct the body to the receipt's number. When the receipt is the
 stale one (the run was repeated), rerun `/ship` so the receipt is rewritten