Add SOXL 20d volatility delever gate

[Pigbibi]

Summary

• add a configurable SOXL volatility delever overlay to soxl_soxx_trend_income
• enable the live default as SOXX 20d annualized volatility >= 50%, redirecting SOXL to SOXX with 0% SOXL retention
• keep BOXX allocation as the residual tier allocation, so the 20d gate does not suppress BOXX targets
• expose diagnostics and execution annotations for live notifications/reports

Tests

• PYTHONPATH=/home/ubuntu/Projects/UsEquityStrategies/src:/home/ubuntu/Projects/QuantPlatformKit/src /home/ubuntu/Projects/LongBridgePlatform/.venv/bin/python -m pytest tests/test_strategy_plans.py::StrategyPlanMetadataTest::test_soxl_soxx_trend_income_exposes_live_tiered_metadata tests/test_strategy_plans.py::StrategyPlanMetadataTest::test_soxl_soxx_trend_income_volatility_delever_redirects_soxl_to_soxx tests/test_strategy_plans.py::StrategyPlanMetadataTest::test_soxl_soxx_trend_income_overlay_cap_can_downgrade_live_tier tests/test_entrypoints.py::StrategyEntrypointTests::test_soxl_soxx_trend_income_entrypoint_maps_target_values_without_execution_fields tests/test_catalog.py -q