fix(plugin): validate plugin id format (#2185)

tests/unit_tests/plugin/test_plugin_id_parsing.py

@@ -0,0 +1,25 @@
+"""Test plugin ID parsing validation."""
+
+import pytest
+
+from src.langbot.pkg.plugin.connector import PluginRuntimeConnector
+
+
+def test_parse_plugin_id_accepts_author_name():
+    assert PluginRuntimeConnector._parse_plugin_id('langbot/rag-engine') == ('langbot', 'rag-engine')
+
+
+@pytest.mark.parametrize(
+    'plugin_id',
+    [
+        '',
+        'author',
+        'author/',
+        '/name',
+        'author/name/extra',
+        '/',
+    ],
+)
+def test_parse_plugin_id_rejects_malformed_ids(plugin_id):
+    with pytest.raises(ValueError, match='Expected'):
+        PluginRuntimeConnector._parse_plugin_id(plugin_id)