feat: add history UX and expand retention-focused roadmap

tests/test_session_store.py

@@ -77,3 +77,53 @@ def test_query_returns_past_sessions(tmp_path: Path) -> None:
     assert isinstance(results[0], PastSession)
     assert results[0].host == "web01"
     assert "package missing" in results[0].summary
+
+
+def test_list_recent_returns_sessions_sorted_desc(tmp_path: Path) -> None:
+    chroma_mock = _make_chromadb_mock()
+    collection = chroma_mock.PersistentClient.return_value.get_or_create_collection.return_value
+    collection.count.return_value = 3
+    collection.get.return_value = {
+        "ids": ["20260506T120000Z", "20260507T120000Z", "20260505T120000Z"],
+        "documents": ["older", "newer", "oldest"],
+        "metadatas": [
+            {"host": "web01", "issue": "i1"},
+            {"host": "web01", "issue": "i2"},
+            {"host": "db01", "issue": "i3"},
+        ],
+    }
+
+    with patch.dict("sys.modules", {"chromadb": chroma_mock}):
+        store = SessionStore(tmp_path / "store")
+        results = store.list_recent(limit=2)
+
+    assert len(results) == 2
+    assert results[0].session_id == "20260507T120000Z"
+    assert results[1].session_id == "20260506T120000Z"
+
+
+def test_search_keyword_filters_by_term_and_host(tmp_path: Path) -> None:
+    chroma_mock = _make_chromadb_mock()
+    collection = chroma_mock.PersistentClient.return_value.get_or_create_collection.return_value
+    collection.count.return_value = 3
+    collection.get.return_value = {
+        "ids": ["20260505T120000Z", "20260506T120000Z", "20260507T120000Z"],
+        "documents": [
+            "Root cause: nginx config typo",
+            "Root cause: package missing",
+            "Root cause: nginx port conflict",
+        ],
+        "metadatas": [
+            {"host": "web01", "issue": "nginx fails"},
+            {"host": "web01", "issue": "sssd fails"},
+            {"host": "db01", "issue": "nginx start failed"},
+        ],
+    }
+
+    with patch.dict("sys.modules", {"chromadb": chroma_mock}):
+        store = SessionStore(tmp_path / "store")
+        results = store.search_keyword("nginx", host="web01", limit=5)
+
+    assert len(results) == 1
+    assert results[0].host == "web01"
+    assert "nginx" in results[0].issue.lower()