fix(plan): apply ruff format to plan.py

Fixes ruff format check failure in CI lint gate.

src/cleveragents/cli/commands/plan.py

@@ -4080,9 +4080,7 @@ def _render_tree_anonymous(
             d_type = str(node.get("type", "unknown"))
             d_id = str(node["decision_id"])
             d_question = str(node.get("question", ""))[:40]
-            icon, col_start, col_end = _TREE_TYPE_COLOURS.get(
-                d_type, ("•", "", "")
-            )
+            icon, col_start, col_end = _TREE_TYPE_COLOURS.get(d_type, ("•", "", ""))
             if not col_start:
                 col_start = f"{_TREE_BOLD}{_TREE_GREEN}"
                 col_end = _TREE_RESET
@@ -4125,9 +4123,7 @@ def _render_tree_anonymous(
         dl = _get_decision_label(
             d.decision_type, decision_ordinals.get(d.decision_id, 0)
         )
-        icon, col_start, col_end = _TREE_TYPE_COLOURS.get(
-            d.decision_type, ("", "", "")
-        )
+        icon, col_start, col_end = _TREE_TYPE_COLOURS.get(d.decision_type, ("", "", ""))
         if col_start:
             lines.append(f"  {icon}{col_start}{dl}: {d.decision_id}{col_end}")
         else: