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-dev/tests/test_loop.py

@@ -386,7 +386,8 @@ def test_an_invented_tool_is_answered_not_run(tmp_path: Path) -> None:
 
 def test_the_turn_cap_ends_a_run(tmp_path: Path) -> None:
     model = ScriptedModel(*[[call("read_file", path="a")]] * 3)
-    outcome = Driver(model, "m", max_turns=3).run(
+    # The same call three times is a circle too (M7.8): here, only the cap.
+    outcome = Driver(model, "m", max_turns=3, circle_repeats=0).run(
         driver_log(tmp_path),
         system="s",
         tools=_tools("read_file"),