test: add CLI startup speed regression test

Guards against heavy imports (matplotlib, torch, scipy) leaking into
the CLI entrypoint via GlobalConfig. Fails if dimos --help takes >8s.

Author: jeff-hykin

dimos/robot/cli/test_cli_startup.py

@@ -0,0 +1,65 @@
+# Copyright 2025-2026 Dimensional Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Guard against import-time regressions in the CLI entrypoint.
+
+`dimos --help` should never pull in heavy ML/viz libraries. If it does,
+startup time balloons from <2s to >5s, which is a terrible UX.
+"""
+
+import subprocess
+import sys
+import time
+
+import pytest
+
+# CI runners are slower — give generous headroom but still catch gross regressions.
+HELP_TIMEOUT_SECONDS = 8
+
+
+def test_help_does_not_import_heavy_deps() -> None:
+    """GlobalConfig import must not drag in matplotlib, torch, or scipy."""
+    result = subprocess.run(
+        [
+            sys.executable,
+            "-c",
+            (
+                "import sys; "
+                "from dimos.core.global_config import GlobalConfig; "
+                "bad = [m for m in ('matplotlib', 'torch', 'scipy') if m in sys.modules]; "
+                "assert not bad, f'Heavy deps imported: {bad}'"
+            ),
+        ],
+        capture_output=True,
+        text=True,
+        timeout=30,
+    )
+    assert result.returncode == 0, f"Heavy deps leaked into GlobalConfig import:\n{result.stderr}"
+
+
+def test_help_startup_time() -> None:
+    """`dimos --help` must finish in under {HELP_TIMEOUT_SECONDS}s."""
+    start = time.monotonic()
+    result = subprocess.run(
+        [sys.executable, "-m", "dimos.robot.cli.dimos", "--help"],
+        capture_output=True,
+        text=True,
+        timeout=HELP_TIMEOUT_SECONDS + 5,  # hard kill safety margin
+    )
+    elapsed = time.monotonic() - start
+    assert result.returncode == 0, f"dimos --help failed:\n{result.stderr}"
+    assert elapsed < HELP_TIMEOUT_SECONDS, (
+        f"dimos --help took {elapsed:.1f}s (limit: {HELP_TIMEOUT_SECONDS}s). "
+        f"Check for heavy imports in the CLI entrypoint or GlobalConfig."
+    )