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-core/src/nisse_core/gitea.py

@@ -97,7 +97,9 @@ SETTLED_MARKER = "<!-- nisse-review: settled -->"
 
 def to_resolve(notes: list[ReviewNote]) -> list[int]:
     """The ids of the unresolved line comments in threads a settled reply
-    closed: every comment on that path:line, as Gitea groups a thread."""
+    closed: every comment on that path:line, as Gitea groups a thread.
+    Gitea resolves one comment at a time (seen on 28.2: the rest of the
+    thread still reports no resolver), and resolving one again is a 204."""
     settled = {
         n.where for n in notes if n.key.startswith("line-") and SETTLED_MARKER in n.body
     }