Support income layer start amount

[Pigbibi]

Summary

• read INCOME_LAYER_START_USD from runtime environment
• pass income_layer_start_usd into strategy runtime overrides
• sync the new variable into Cloud Run environment

Tests

• python -m py_compile runtime_config_support.py strategy_runtime.py
• pytest targeted income-layer runtime/config tests
• bash tests/test_sync_cloud_run_env_workflow.sh

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Scope income layer start overrides to supported profiles

When INCOME_LAYER_START_USD is set for any deployment whose selected profile is not soxl_soxx_trend_income (for example tqqq_growth_income), this unconditional override is merged into the runtime config and then the vendored evaluate_tqqq_growth_income passes it through as **config to build_rebalance_plan, whose signature has no income_layer_start_usd parameter. That makes runtime evaluation fail with an unexpected-keyword TypeError instead of producing a rebalance plan, so this override should be gated to the profile(s) that actually accept it.

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