Add crisis plugin trigger rehearsal tests

[Pigbibi]

Summary

• add a Schwab request-handling rehearsal for a triggered crisis_response_shadow signal
• verify true_crisis/defend reaches the execution report while shadow execution controls still deny broker orders and live allocation mutation
• add zh notification rendering coverage for true_crisis/defend
• keep Schwab profile/notification tests compatible with QuantPlatformKit exposing global_etf_confidence_vol_gate as either an alias or canonical profile

Tests

• /home/ubuntu/Projects/CharlesSchwabPlatform/.venv/bin/python -m pytest tests/test_request_handling.py::RequestHandlingTests::test_handle_schwab_attaches_strategy_plugin_report tests/test_request_handling.py::RequestHandlingTests::test_handle_schwab_rehearses_triggered_shadow_plugin_report tests/test_request_handling.py::RequestHandlingTests::test_strategy_plugin_notification_line_uses_i18n tests/test_request_handling.py::RequestHandlingTests::test_strategy_plugin_notification_line_renders_triggered_shadow_signal tests/test_request_handling.py::RequestHandlingTests::test_handle_schwab_reports_plugin_config_error_without_blocking_strategy tests/test_rebalance_service.py::RebalanceServiceTests::test_run_strategy_core_adds_plugin_context_to_heartbeat tests/test_runtime_composer.py
• /home/ubuntu/Projects/CharlesSchwabPlatform/.venv/bin/python -m unittest discover -s tests -v
• /home/ubuntu/Projects/CharlesSchwabPlatform/.venv/bin/python -m ruff check .