fix(OperationsCenter): stop custodian sweep zero-finding Plane mutations

src/operations_center/entrypoints/custodian_sweep/main.py

@@ -223,6 +223,8 @@ def _emit(
     title = f"[{sweep.repo_key}] custodian sweep: {sweep.total} findings"
     body = _render_body(sweep, deltas)
     existing = existing_tasks.get(sweep.repo_key)
+    if sweep.error is None and sweep.total == 0:
+        return "skipped-zero-findings" if not dry_run else "would-skip-zero-findings"
     if dry_run:
         return "would-comment" if existing else "would-create"
     if existing:

tests/test_custodian_sweep.py

@@ -18,6 +18,7 @@
     _DEDUP_LABEL_PREFIX,
     _delta,
     _discover_targets,
+    _emit,
     _find_open_sweep_task,
     _index_open_sweep_tasks,
     _render_body,
@@ -121,6 +122,43 @@ def test_index_open_sweep_tasks_maps_repo_key_to_issue() -> None:
     }
 
 
+def test_emit_skips_zero_finding_repo_without_plane_calls() -> None:
+    calls: list[tuple[str, object]] = []
+
+    plane = SimpleNamespace(
+        comment_issue=lambda issue_id, body: calls.append(("comment", issue_id, body)),
+        create_issue=lambda **kwargs: calls.append(("create", kwargs)),
+    )
+
+    action = _emit(
+        _RepoSweep(repo_key="Demo", envelope=_envelope()),
+        {},
+        plane,
+        existing_tasks={},
+        dry_run=False,
+    )
+
+    assert action == "skipped-zero-findings"
+    assert calls == []
+
+
+def test_emit_dry_run_reports_zero_finding_skip() -> None:
+    plane = SimpleNamespace(
+        comment_issue=lambda issue_id, body: None,
+        create_issue=lambda **kwargs: None,
+    )
+
+    action = _emit(
+        _RepoSweep(repo_key="Demo", envelope=_envelope()),
+        {},
+        plane,
+        existing_tasks={},
+        dry_run=True,
+    )
+
+    assert action == "would-skip-zero-findings"
+
+
 def test_discover_targets_filters_to_repos_with_custodian_yaml(tmp_path: Path) -> None:
     has_yaml = tmp_path / "WithYaml"
     has_yaml.mkdir()