Fixes from the rest of the live session

- A near miss for abandon ("abort", "cancel", "drop it", ...) in an item's
  thread is asked about, and changes nothing.
- The driver is told only the operator stops or closes an item, so it
  doesn't claim to have done either.
- An issue assigned again after its item closed starts a new item that
  notes the one before (Gitea's timeline gives the assignment time);
  item_for_issue returns the latest item.
- Abandoning an issue Gitea won't close because of open dependencies says
  so, naming them.
- An agreed item isn't offered restate.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPQ14L3LikyefCMFBqEbKE

nisse-dev/tests/test_loop_properties.py

@@ -400,7 +400,13 @@ class Walk:
         where = f"seed {self.seed}, steps {self.steps}"
         store = self.world["store"]
         items = self.items()
-        issues = [(i.scope, loop_of(i).issue) for i in items if loop_of(i).issue]
+        # Open items: an issue assigned again after its item closed gets a new
+        # one (D1), which loop.qnt doesn't model.
+        issues = [
+            (i.scope, loop_of(i).issue)
+            for i in items
+            if loop_of(i).issue and i.status == "open"
+        ]
         assert len(issues) == len(set(issues)), f"one_item_per_issue: {where}"
         for item in items:
             loop = loop_of(item)