fix: harden hook command detection

tests/test_settings_hook_detection.py

@@ -0,0 +1,23 @@
+from __future__ import annotations
+
+from collections.abc import Callable
+
+import pytest
+
+from elydora.plugins.claudecode import _is_elydora_hook as is_claude_hook
+from elydora.plugins.gemini import _is_elydora_hook as is_gemini_hook
+from elydora.plugins.letta import _is_elydora_hook as is_letta_hook
+
+
+HookDetector = Callable[[dict, str], bool]
+
+
+@pytest.mark.parametrize("detector", [is_claude_hook, is_gemini_hook, is_letta_hook])
+def test_hook_detection_handles_only_string_commands(detector: HookDetector) -> None:
+    assert detector({"command": 42}, "") is False
+    assert detector({"hooks": [{"command": None}]}, "") is False
+    assert detector({"hooks": [{"command": "run .elydora/agent-1/hook.py"}]}, "") is True
+    assert detector(
+        {"hooks": [{"command": "run .elydora/agent-1/hook.py"}]},
+        "agent-2",
+    ) is False