Runs that go in circles end (M7.8)

Driver.run checks each turn with nisse_core.loop.circles and ends the run
as "circling" when the same calls get much the same back, one harness
correction is given again and again, or the model apologises, for
circle_repeats turns in a row (default 3). Near-identical calls (git add
a.py, b.py) and scattered apologies stay flags on the status page. A
fact in the transcript says why the run ended.

nisse-dev calls in a helper as for a stuck run, then asks the operator;
nisse-review counts a failed run and posts none of its drafts. Tuning:
tuning.driver / tuning.review circle_repeats (0 off) and circle_similar.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01J5Utyfzw7gF7UhjRDEtjTk

nisse-review.example.yaml

@@ -36,6 +36,7 @@ gitea:
 
 # tuning:                             # docs/Tuning-Guide.md
 #   review: {poll_s: 60, max_turns: 40, diff_chars: 60000, attempts: 2,
-#            ci_wait_s: 3600, ci_grace_s: 120, max_rounds: 4}
+#            ci_wait_s: 3600, ci_grace_s: 120, max_rounds: 4,
+#            circle_repeats: 3, circle_similar: 0.9}
 #   expert: {consult_budget: 3}
 #   context: {keep_recent_turns: 6, safety_margin: 0.1}