fix: address PR review comments on test suite

- Rename test_start_http_401_unauthorized to test_list_http_401_unauthorized
  to match the actual action="list" being tested (threads #19, #23)
- Use consistent PrefixedID format ("a"*64+":local") in test_start_container
  instead of "abc123def456"*4 concatenation (thread #37)
- Refactor container_actions_require_id to use @pytest.mark.parametrize
  so each action runs independently (thread #18)
- Fix docstring claiming ToolError for test that asserts success in
  test_stop_mutation_returns_null (thread #26)
- Fix inaccurate comment about `in` operator checking truthiness;
  it checks key existence (thread #25)
- Add edge case tests for temperature=0, temperature=null, and
  logFile=null in test_storage.py (thread #31)

Resolves review threads: PRRT_kwDOO6Hdxs5uvO2-, PRRT_kwDOO6Hdxs5uvOcf,
PRRT_kwDOO6Hdxs5uu7zx, PRRT_kwDOO6Hdxs5uvO28, PRRT_kwDOO6Hdxs5uvOcp,
PRRT_kwDOO6Hdxs5uvOcn, PRRT_kwDOO6Hdxs5uvKr3

tests/test_storage.py

@@ -109,6 +109,45 @@ class TestStorageActions:
         assert result["summary"]["temperature"] == "35\u00b0C"
         assert "1.00 GB" in result["summary"]["size_formatted"]
 
+    async def test_disk_details_temperature_zero(self, _mock_graphql: AsyncMock) -> None:
+        """Temperature of 0 should display as '0\u00b0C', not 'N/A'."""
+        _mock_graphql.return_value = {
+            "disk": {
+                "id": "d:1",
+                "device": "sda",
+                "name": "WD",
+                "serialNum": "SN1",
+                "size": 1073741824,
+                "temperature": 0,
+            }
+        }
+        tool_fn = _make_tool()
+        result = await tool_fn(action="disk_details", disk_id="d:1")
+        assert result["summary"]["temperature"] == "0\u00b0C"
+
+    async def test_disk_details_temperature_null(self, _mock_graphql: AsyncMock) -> None:
+        """Null temperature should display as 'N/A'."""
+        _mock_graphql.return_value = {
+            "disk": {
+                "id": "d:1",
+                "device": "sda",
+                "name": "WD",
+                "serialNum": "SN1",
+                "size": 1073741824,
+                "temperature": None,
+            }
+        }
+        tool_fn = _make_tool()
+        result = await tool_fn(action="disk_details", disk_id="d:1")
+        assert result["summary"]["temperature"] == "N/A"
+
+    async def test_logs_null_log_file(self, _mock_graphql: AsyncMock) -> None:
+        """logFile being null should return an empty dict."""
+        _mock_graphql.return_value = {"logFile": None}
+        tool_fn = _make_tool()
+        result = await tool_fn(action="logs", log_path="/var/log/syslog")
+        assert result == {}
+
     async def test_disk_details_not_found(self, _mock_graphql: AsyncMock) -> None:
         _mock_graphql.return_value = {"disk": None}
         tool_fn = _make_tool()