[codex] Promote TQQQ fixed dual-drive defaults

[Pigbibi]

Summary

• Promote tqqq_growth_income defaults to the fixed QQQ/TQQQ dual-drive live profile.
• Keep income-layer logic available, but disable it by default with a high threshold.
• Change the idle sleeve to BOXX with a 2% cash buffer: active target is 45% QQQ / 45% TQQQ / 8% BOXX / 2% cash; defensive target is 98% BOXX / 2% cash.
• Add coverage for the stateful MA200 exit behavior so MA20 slope is used for entry/re-entry, not as a forced exit while QQQ remains above MA200.

Validation

• uv run --with pytest --with pandas --with numpy --with pytz --with git+https://github.com/QuantStrategyLab/QuantPlatformKit.git@v0.7.16 python -m pytest tests/test_strategy_plans.py tests/test_entrypoints.py tests/test_catalog.py -q
• git diff --check
• uv run --with ruff ruff check src/us_equity_strategies/catalog.py src/us_equity_strategies/entrypoints/__init__.py src/us_equity_strategies/manifests/__init__.py src/us_equity_strategies/strategies/tqqq_growth_income.py tests/test_entrypoints.py tests/test_strategy_plans.py

Follow-up after merge

• Tag this package as v0.7.25.
• Open platform PRs for InteractiveBrokersPlatform, CharlesSchwabPlatform, and LongBridgePlatform to consume v0.7.25.
• Verify Schwab Cloud Run / env sync is not forcing the old INCOME_THRESHOLD_USD=100000 override.