Pass reserved cash policy to strategy runtime

[Pigbibi]

Summary

• pass positive reserved cash floor/ratio into strategy runtime overrides
• update UsEquityStrategies dependency to 0cd90a37 with cash-reserve floor support
• add regression coverage for runtime reserve policy overrides

Tests

• PYTHONPATH=. timeout 180 /tmp/qsl-followup-pytest-venv-20260619/bin/python -m pytest tests/test_strategy_runtime.py::StrategyRuntimeTests::test_load_strategy_runtime_applies_reserved_cash_policy_overrides_from_settings
• git diff --check

[chatgpt-codex-connector]

💡 Codex Review

LongBridgePlatform/runtime_config_support.py

Lines 296 to 297 in bbc0987

	dca_mode=_optional_dca_mode_env("DCA_MODE"),
	dca_base_investment_usd=_optional_positive_float_env("DCA_BASE_INVESTMENT_USD"),

Propagate DCA overrides through Cloud Run sync

When a DCA profile is configured via GitHub Environment variables, these new settings never reach Cloud Run: I checked .github/workflows/sync-cloud-run-env.yml, and the job maps/syncs the LongBridge runtime vars around lines 110-125 and 755-765 but has no DCA_MODE or DCA_BASE_INVESTMENT_USD entries. As a result these fields stay None after the normal sync workflow, so _apply_dca_runtime_overrides leaves live ibit_smart_dca/nasdaq_sp500_smart_dca on package defaults even when operators configure the new DCA vars in the deployment environment.

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