fix: widen WS not-found substring check to "doesn't exist" phrasing

PR #1397 CI on commit 70b9edf failed both required-trio E2E lanes:

    AssertionError: Expected error code RESOURCE_NOT_FOUND, got:
    {'code': 'SERVICE_CALL_FAILED', 'message': "Failed to delete category:
    Command failed: Category ID doesn't exist", ...}

HA Core's category-registry remove path surfaces the not-found case
with the phrasing ``Category ID doesn't exist`` — not ``not found``.
The KP13-review-item-4 substring check at the six mutation sites
(``tools_zones.py:317/404``, ``tools_labels.py:249/338``,
``tools_categories.py:255/361``) only matched ``"not found"``, so the
branch fell through to ``SERVICE_CALL_FAILED`` against the live HA
test container.

Widened the check to accept either phrasing at all six sites:

    if "not found" in error_str or "doesn't exist" in error_str:

Mirrors the pre-#1297 ``test_category_crud.py`` assertion which already
accepted both phrasings (``"doesn't exist" in error_msg or "not found"
in error_msg``) — that's the empirical signal that both forms are in
HA's WS-bridge vocabulary across this surface.

New unit test ``test_remove_with_doesnt_exist_phrasing`` in
``TestCategoryMutationRoutesNotFoundToResourceNotFound`` pins the
``"doesn't exist"`` branch directly against the same mock shape that
HA Core returned in CI.

Author: Patch76

src/ha_mcp/tools/tools_categories.py

@@ -252,7 +252,7 @@ async def ha_config_set_category(
                 }
             else:
                 error_str = str(result.get("error", "")).lower()
-                if "not found" in error_str:
+                if "not found" in error_str or "doesn't exist" in error_str:
                     raise_tool_error(
                         create_error_response(
                             ErrorCode.RESOURCE_NOT_FOUND,
@@ -358,7 +358,7 @@ async def ha_config_remove_category(
                 }
             else:
                 error_str = str(result.get("error", "")).lower()
-                if "not found" in error_str:
+                if "not found" in error_str or "doesn't exist" in error_str:
                     raise_tool_error(
                         create_error_response(
                             ErrorCode.RESOURCE_NOT_FOUND,

src/ha_mcp/tools/tools_labels.py

@@ -246,7 +246,7 @@ async def ha_config_set_label(
                 }
             else:
                 error_str = str(result.get("error", "")).lower()
-                if "not found" in error_str:
+                if "not found" in error_str or "doesn't exist" in error_str:
                     raise_tool_error(
                         create_error_response(
                             ErrorCode.RESOURCE_NOT_FOUND,
@@ -335,7 +335,7 @@ async def ha_config_remove_label(
                 }
             else:
                 error_str = str(result.get("error", "")).lower()
-                if "not found" in error_str:
+                if "not found" in error_str or "doesn't exist" in error_str:
                     raise_tool_error(
                         create_error_response(
                             ErrorCode.RESOURCE_NOT_FOUND,

src/ha_mcp/tools/tools_zones.py

@@ -314,7 +314,7 @@ async def ha_set_zone(
                 return response
             else:
                 error_str = str(result.get("error", "")).lower()
-                if "not found" in error_str:
+                if "not found" in error_str or "doesn't exist" in error_str:
                     raise_tool_error(
                         create_error_response(
                             ErrorCode.RESOURCE_NOT_FOUND,
@@ -401,7 +401,7 @@ async def ha_remove_zone(
                 }
             else:
                 error_str = str(result.get("error", "")).lower()
-                if "not found" in error_str:
+                if "not found" in error_str or "doesn't exist" in error_str:
                     raise_tool_error(
                         create_error_response(
                             ErrorCode.RESOURCE_NOT_FOUND,

tests/src/unit/test_error_code_consistency_1297.py

@@ -340,6 +340,25 @@ async def test_remove_with_missing_category_id(self, tools, mock_ws_client):
             "ha_config_get_category" in s for s in _all_suggestions(error_data["error"])
         )
 
+    async def test_remove_with_doesnt_exist_phrasing(self, tools, mock_ws_client):
+        """HA Core's category-registry remove path surfaces the not-found case
+        with the phrasing ``"Category ID doesn't exist"`` rather than the more
+        common ``"not found"`` (observed live in PR #1397 CI on commit 70b9edf).
+        The substring check must accept both phrasings.
+        """
+        mock_ws_client.send_websocket_message.return_value = {
+            "success": False,
+            "error": "Category ID doesn't exist",
+        }
+
+        with pytest.raises(ToolError) as exc_info:
+            await tools.ha_config_remove_category(
+                scope="automation", category_id="missing"
+            )
+
+        error_data = json.loads(str(exc_info.value))
+        assert error_data["error"]["code"] == "RESOURCE_NOT_FOUND"
+
 
 class TestZoneMutationRoutesNotFoundToResourceNotFound:
     """Zone set-update / remove with a non-existent ``zone_id`` must surface