Implement approval engine production readiness

Assistant: codex
Assistant-Model: gpt-5.6-sol
Assistant-Session: 01a05e2e-805b-7042-a750-71f473bceea2

tests/test_cli.py

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+import json
+
+import pytest
+
+from approval_engine.cli import main
+
+
+def test_migrate_verify_and_backup_commands(tmp_path, capsys):
+    database = tmp_path / "approval.sqlite"
+    backup = tmp_path / "approval.backup.sqlite"
+    assert main(["migrate", "--db", str(database)]) == 0
+    migrated = json.loads(capsys.readouterr().out)
+    assert migrated["ok"] is True
+    assert main(["verify", "--db", str(database)]) == 0
+    assert json.loads(capsys.readouterr().out)["schema_current"] is True
+    assert main(["backup", "--db", str(database), "--output", str(backup)]) == 0
+    assert json.loads(capsys.readouterr().out)["integrity"] == "ok"
+
+
+def test_production_refuses_memory_store_before_serving():
+    with pytest.raises(SystemExit):
+        main(["serve", "--production", "--db", ":memory:"])