test(gateway): repoint slash-command mocks after mixin extraction

Tests for the extracted handlers mocked symbols at gateway.run.*; the handlers
now resolve top-level-imported deps (atomic_json_write, fetch_account_usage,
render_account_usage_lines) and __file__ from gateway.slash_commands. Repoint
those mocks. run.py-resident methods (_increment_restart_failure_counts,
_clear_restart_failure_count) keep their gateway.run.atomic_json_write mock —
only the moved handlers' mocks change.

tests/gateway/ 6415 passed / 0 failed.

tests/gateway/test_restart_notification.py

@@ -153,6 +153,10 @@ async def test_restart_command_uses_atomic_json_writes_for_marker_files(tmp_path
     def _fake_atomic_json_write(path, payload, **kwargs):
         calls.append((Path(path).name, payload, kwargs))
 
+    # _handle_restart_command lives in gateway/slash_commands.py (extracted from
+    # run.py); it uses that module's top-level atomic_json_write import.
+    import gateway.slash_commands as gateway_slash
+    monkeypatch.setattr(gateway_slash, "atomic_json_write", _fake_atomic_json_write)
     monkeypatch.setattr(gateway_run, "atomic_json_write", _fake_atomic_json_write)
 
     runner, _adapter = make_restart_runner()

tests/gateway/test_update_command.py

@@ -86,12 +86,15 @@ class TestHandleUpdateCommand:
             class FakePath(type(Path())):
                 pass
 
-            # Actually, simplest: just patch the specific file attr
+            # Actually, simplest: just patch the specific file attr.
-            fake_file = str(fake_root / "gateway" / "run.py")
+            # The _handle_update_command handler lives in gateway/slash_commands.py
+            # (extracted from run.py in the god-file decomposition); it resolves
+            # project_root via Path(__file__).parent.parent, so fake that file.
+            fake_file = str(fake_root / "gateway" / "slash_commands.py")
             (fake_root / "gateway").mkdir(parents=True)
-            (fake_root / "gateway" / "run.py").touch()
+            (fake_root / "gateway" / "slash_commands.py").touch()
 
-            with patch("gateway.run.__file__", fake_file):
+            with patch("gateway.slash_commands.__file__", fake_file):
                 result = await runner._handle_update_command(event)
 
         assert "Not a git repository" in result

tests/gateway/test_usage_command.py

@@ -188,11 +188,11 @@ class TestUsageAccountSection:
         event = MagicMock()
 
         monkeypatch.setattr(
-            "gateway.run.fetch_account_usage",
+            "gateway.slash_commands.fetch_account_usage",
             lambda provider, base_url=None, api_key=None: object(),
         )
         monkeypatch.setattr(
-            "gateway.run.render_account_usage_lines",
+            "gateway.slash_commands.render_account_usage_lines",
             lambda snapshot, markdown=False: [
                 "📈 **Account limits**",
                 "Provider: openai-codex (Pro)",
@@ -235,11 +235,11 @@ class TestUsageAccountSection:
 
         monkeypatch.setattr("gateway.run.asyncio.to_thread", _fake_to_thread)
         monkeypatch.setattr(
-            "gateway.run.fetch_account_usage",
+            "gateway.slash_commands.fetch_account_usage",
             lambda provider, base_url=None, api_key=None: object(),
         )
         monkeypatch.setattr(
-            "gateway.run.render_account_usage_lines",
+            "gateway.slash_commands.render_account_usage_lines",
             lambda snapshot, markdown=False: [
                 "📈 **Account limits**",
                 "Provider: openai-codex (Pro)",