feat(runner): unify plugin execution across agents and event processors

tests/unit_tests/persistence/test_runner_state_migration.py

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+"""Preserve persisted invocation state while normalizing the Runner table name."""
+
+import importlib
+from unittest.mock import patch
+
+import pytest
+import sqlalchemy as sa
+from alembic.migration import MigrationContext
+from alembic.operations import Operations
+
+migration = importlib.import_module('langbot.pkg.persistence.alembic.versions.0024_unify_runner_state')
+
+
+@pytest.mark.parametrize('current_table_exists', [False, True])
+def test_upgrade_preserves_state_and_downgrade_restores_name(current_table_exists):
+    engine = sa.create_engine('sqlite://')
+    with engine.begin() as conn:
+        conn.execute(sa.text('CREATE TABLE agent_runner_state (id INTEGER PRIMARY KEY, value_json TEXT)'))
+        conn.execute(sa.text("INSERT INTO agent_runner_state VALUES (1, 'saved value')"))
+        if current_table_exists:
+            conn.execute(sa.text('CREATE TABLE runner_state (id INTEGER PRIMARY KEY, value_json TEXT)'))
+        with patch.object(migration, 'op', Operations(MigrationContext.configure(conn))):
+            migration.upgrade()
+            assert 'agent_runner_state' not in sa.inspect(conn).get_table_names()
+            assert conn.scalar(sa.text('SELECT value_json FROM runner_state')) == 'saved value'
+            migration.downgrade()
+            assert 'runner_state' not in sa.inspect(conn).get_table_names()
+            assert conn.scalar(sa.text('SELECT value_json FROM agent_runner_state')) == 'saved value'
+    engine.dispose()
+
+
+def test_two_populated_tables_fail_without_discarding_either():
+    engine = sa.create_engine('sqlite://')
+    with engine.begin() as conn:
+        for name in ('agent_runner_state', 'runner_state'):
+            conn.execute(sa.text(f'CREATE TABLE {name} (id INTEGER PRIMARY KEY)'))
+            conn.execute(sa.text(f'INSERT INTO {name} VALUES (1)'))
+        with patch.object(migration, 'op', Operations(MigrationContext.configure(conn))):
+            with pytest.raises(RuntimeError, match='Both .* contain state'):
+                migration.upgrade()
+        assert set(sa.inspect(conn).get_table_names()) == {'agent_runner_state', 'runner_state'}
+    engine.dispose()