fix: CI failures — update workflow for uv migration, fix lint and format

- Switch CI install step from `pip install -r requirements.txt` to
  `pip install -e ".[dev]"` since requirements.txt was removed
- Add noqa: E402 to intentionally-late imports in conftest.py
  (HOME must be isolated before mempalace imports)
- Remove unused KnowledgeGraph import in test_knowledge_graph.py
- Apply ruff formatting to test files

tests/conftest.py

@@ -27,11 +27,11 @@ os.environ["HOMEDRIVE"] = os.path.splitdrive(_session_tmp)[0] or "C:"
 os.environ["HOMEPATH"] = os.path.splitdrive(_session_tmp)[1] or _session_tmp
 
 # Now it is safe to import mempalace modules that trigger initialisation.
-import chromadb
-import pytest
+import chromadb  # noqa: E402
+import pytest  # noqa: E402
 
-from mempalace.config import MempalaceConfig
-from mempalace.knowledge_graph import KnowledgeGraph
+from mempalace.config import MempalaceConfig  # noqa: E402
+from mempalace.knowledge_graph import KnowledgeGraph  # noqa: E402
 
 
 @pytest.fixture(scope="session", autouse=True)
@@ -108,10 +108,38 @@ def seeded_collection(collection):
             "Evaluate ChromaDB alternatives for vector search.",
         ],
         metadatas=[
-            {"wing": "project", "room": "backend", "source_file": "auth.py", "chunk_index": 0, "added_by": "miner", "filed_at": "2026-01-01T00:00:00"},
-            {"wing": "project", "room": "backend", "source_file": "db.py", "chunk_index": 0, "added_by": "miner", "filed_at": "2026-01-02T00:00:00"},
-            {"wing": "project", "room": "frontend", "source_file": "App.tsx", "chunk_index": 0, "added_by": "miner", "filed_at": "2026-01-03T00:00:00"},
-            {"wing": "notes", "room": "planning", "source_file": "sprint.md", "chunk_index": 0, "added_by": "miner", "filed_at": "2026-01-04T00:00:00"},
+            {
+                "wing": "project",
+                "room": "backend",
+                "source_file": "auth.py",
+                "chunk_index": 0,
+                "added_by": "miner",
+                "filed_at": "2026-01-01T00:00:00",
+            },
+            {
+                "wing": "project",
+                "room": "backend",
+                "source_file": "db.py",
+                "chunk_index": 0,
+                "added_by": "miner",
+                "filed_at": "2026-01-02T00:00:00",
+            },
+            {
+                "wing": "project",
+                "room": "frontend",
+                "source_file": "App.tsx",
+                "chunk_index": 0,
+                "added_by": "miner",
+                "filed_at": "2026-01-03T00:00:00",
+            },
+            {
+                "wing": "notes",
+                "room": "planning",
+                "source_file": "sprint.md",
+                "chunk_index": 0,
+                "added_by": "miner",
+                "filed_at": "2026-01-04T00:00:00",
+            },
         ],
     )
     return collection

tests/test_dialect.py

@@ -148,7 +148,9 @@ class TestZettelEncoding:
 class TestDecode:
     def test_decode_roundtrip(self):
         d = Dialect()
-        encoded = "001|ALC+BOB|2025-01-01|test_title\nARC:journey\n001:ALC|memory_ai|\"test quote\"|0.9|joy"
+        encoded = (
+            '001|ALC+BOB|2025-01-01|test_title\nARC:journey\n001:ALC|memory_ai|"test quote"|0.9|joy'
+        )
         decoded = d.decode(encoded)
         assert decoded["header"]["file"] == "001"
         assert decoded["arc"] == "journey"

tests/test_knowledge_graph.py

@@ -5,8 +5,6 @@ Covers: entity CRUD, triple CRUD, temporal queries, invalidation,
 timeline, stats, and edge cases (duplicate triples, ID collisions).
 """
 
-from mempalace.knowledge_graph import KnowledgeGraph
-
 
 class TestEntityOperations:
     def test_add_entity(self, kg):

tests/test_mcp_server.py

@@ -58,11 +58,13 @@ class TestHandleRequest:
     def test_unknown_tool(self):
         from mempalace.mcp_server import handle_request
 
-        resp = handle_request({
-            "method": "tools/call",
-            "id": 3,
-            "params": {"name": "nonexistent_tool", "arguments": {}},
-        })
+        resp = handle_request(
+            {
+                "method": "tools/call",
+                "id": 3,
+                "params": {"name": "nonexistent_tool", "arguments": {}},
+            }
+        )
         assert resp["error"]["code"] == -32601
 
     def test_unknown_method(self):
@@ -78,11 +80,13 @@ class TestHandleRequest:
         # Create a collection so status works
         _get_collection(palace_path, create=True)
 
-        resp = handle_request({
-            "method": "tools/call",
-            "id": 5,
-            "params": {"name": "mempalace_status", "arguments": {}},
-        })
+        resp = handle_request(
+            {
+                "method": "tools/call",
+                "id": 5,
+                "params": {"name": "mempalace_status", "arguments": {}},
+            }
+        )
         assert "result" in resp
         content = json.loads(resp["result"]["content"][0]["text"])
         assert "total_drawers" in content

tests/test_searcher.py

@@ -24,10 +24,7 @@ class TestSearchMemories:
 
     def test_wing_and_room_filter(self, palace_path, seeded_collection):
         result = search_memories("code", palace_path, wing="project", room="frontend")
-        assert all(
-            r["wing"] == "project" and r["room"] == "frontend"
-            for r in result["results"]
-        )
+        assert all(r["wing"] == "project" and r["room"] == "frontend" for r in result["results"])
 
     def test_n_results_limit(self, palace_path, seeded_collection):
         result = search_memories("code", palace_path, n_results=2)