Fix runtime settings defaults

[Pigbibi]

Summary

• Preserve runtime target enabled default when env flag is omitted.
• Keep optional runtime booleans nullable and update supported profile expectations.
• Add missing combo strategy translations for notifications.

Test Plan

• python3 -m pytest tests/test_runtime_config_support.py tests/test_notifications.py tests/test_dependency_pins.py -q && git diff --check

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Gate combo profiles until their inputs are wired

Adding these combo profiles to the supported LongBridge set makes them appear in the status/sync flows, but the runtime adapter path still cannot supply their required inputs: us_equity_combo requires russell_snapshot and current_holdings, and us_equity_combo_leveraged requires market_data, while application/runtime_strategy_adapters.py only materializes market/benchmark/QQQ history, derived indicators, portfolio snapshots, and account state before calling build_strategy_evaluation_inputs. In any Cloud Run target selecting either combo profile, evaluation will be invoked without the required inputs and fail before producing a rebalance plan, so these should stay gated or the missing input plumbing should be added first.

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