[codex] Add DCA runtime settings

[Pigbibi]

Summary

• Parse DCA_MODE and DCA_BASE_INVESTMENT_USD from runtime settings.
• Map fixed/smart DCA settings to UsEquityStrategies runtime config.
• Bump UsEquityStrategies dependency to 361338f60900182e3be535cd5fd2be2b9a07b422.

Validation

• python3 -m py_compile runtime_config_support.py strategy_runtime.py tests/test_strategy_runtime.py
• lightweight stub import check for _build_runtime_overrides DCA mapping

Note

• Full local unittest run is blocked on this VPS by missing quant_platform_kit dependency.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Wire DCA overrides into Cloud Run env sync

When these new DCA_MODE / DCA_BASE_INVESTMENT_USD settings are configured as GitHub environment variables and the standard .github/workflows/sync-cloud-run-env.yml workflow is used, they are never passed to Cloud Run: the workflow's optional override env block currently only exposes the income vars at lines 156-161, and the update/remove block only syncs those income vars at lines 934-955. As a result the new fields remain None in managed deployments unless operators manually edit the Cloud Run service outside the repo workflow, so the DCA runtime controls added here have no effect in the normal deployment path.

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