nisse-dev: a settled reply posted top-level is no point to answer either

nisse-review's review of #169: a reply quoting a top-level point, or one
Gitea refused on its line, arrives through list_comments, so answering it
would start the thank-you loop again. Also records what the live Gitea
showed: resolving is per comment, and resolving again is a 204.

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

nisse-dev/src/nisse_dev/loop/agent.py

@@ -1111,6 +1111,8 @@ class LoopAgent:
                 loop = replace(loop, comments=comment.id)
                 if comment.author == self._account:
                     continue  # its own replies
+                if SETTLED_MARKER in comment.body:
+                    continue  # a settled reply posted top-level: nothing to answer
                 if comment.author not in self._gitea_operators:
                     point = f"c{comment.id}"
                     loop = self._peer_point(