fix(consistency): preserve repository domain in briefs

Assistant: codex
Assistant-Model: gpt-5.6-sol
Assistant-Session: 01a02b22-9638-76d2-bbff-b7ea1770b118

tests/test_consistency_check.py

@@ -41,6 +41,7 @@ from consistency_check import (
     _patch_frontmatter_field,
     _patch_task_status_in_file,
     _report_needs_action,
+    _write_custodian_brief,
     archive_closed_workplans,
     canonical_workplan_filename,
     check_repo,
@@ -72,6 +73,63 @@ class TestResolveTopicDomainSlug:
         assert resolve_topic_domain_slug("custodian", repo_market_domain="infotech") == "infotech"
 
 
+class TestCustodianBriefDomain:
+    @staticmethod
+    def _install_common_mocks(monkeypatch, calls, repo_payload, topic_payload=None):
+        def fake_get(_api_base, path, params=None):
+            calls.append((path, params))
+            if path == "/repos/demo":
+                return repo_payload
+            if path == "/workplans":
+                return [{"id": "wp-1", "title": "Open", "topic_id": None}]
+            if path == "/tasks":
+                return []
+            if path == "/repo-goals":
+                return []
+            if path.startswith("/topics/"):
+                return topic_payload
+            if path == "/messages":
+                return []
+            return None
+
+        monkeypatch.setattr("consistency_check._api_get", fake_get)
+        monkeypatch.setattr(
+            "consistency_check._git_commit_writeback", lambda *args, **kwargs: True
+        )
+
+    def test_brief_prefers_repository_domain_when_workplan_topic_is_null(
+        self, tmp_path, monkeypatch
+    ):
+        calls = []
+        self._install_common_mocks(
+            monkeypatch,
+            calls,
+            {"id": "repo-1", "domain_slug": "infotech"},
+        )
+
+        assert _write_custodian_brief("http://unused", "demo", str(tmp_path)) is True
+        brief = (tmp_path / ".custodian-brief.md").read_text(encoding="utf-8")
+        assert "**Domain:** infotech" in brief
+        assert '`get_domain_summary("infotech")`' in brief
+        assert not any(path.startswith("/topics/") for path, _params in calls)
+
+    def test_brief_retains_topic_fallback_for_legacy_repo_response(
+        self, tmp_path, monkeypatch
+    ):
+        calls = []
+        self._install_common_mocks(
+            monkeypatch,
+            calls,
+            {"id": "repo-1"},
+            {"domain_slug": "financials"},
+        )
+
+        assert _write_custodian_brief("http://unused", "demo", str(tmp_path)) is True
+        brief = (tmp_path / ".custodian-brief.md").read_text(encoding="utf-8")
+        assert "**Domain:** financials" in brief
+        assert any(path.startswith("/topics/") for path, _params in calls)
+
+
 class TestRepoManagerConformanceAdapter:
     def test_surfaces_repo_manager_findings_without_reimplementing_rules(self, tmp_path, monkeypatch):
         rmgr = tmp_path / "rmgr"