[codex] Align IBKR strategy runtime contracts

[Pigbibi]

Summary

• wire IBKR feature-snapshot evaluation through the shared QuantPlatformKit runtime helper
• make switch-plan and Cloud Run env sync consume artifact/config/reconciliation policies instead of profile-name branches
• default bundled_or_env strategy configs to the packaged canonical config and remove stale IBKR_STRATEGY_CONFIG_PATH unless explicitly overriding
• clean obsolete local research/backtest artifacts now that live strategies are migrated
• remove obsolete research-era tests for retired TQQQ/SOXL strategy variants

Why

IBKR should stay a thin broker runtime: provide broker/account inputs, call the strategy contract, and map decisions to execution without owning strategy-private snapshot/config logic.

Validation

• PYTHONPATH=. PYTEST_DISABLE_PLUGIN_AUTOLOAD=1 .venv/bin/python -m pytest -q tests -> 110 passed
• .venv/bin/python -m ruff check strategy_runtime.py runtime_config_support.py scripts/print_strategy_switch_env_plan.py tests -> passed
• bash tests/test_sync_cloud_run_env_workflow.sh -> passed
• Earlier focused check: .venv/bin/python -m pytest tests/test_strategy_runtime.py tests/test_snapshot_strategy_runtime.py tests/test_runtime_config_support.py tests/test_strategy_loader.py -> 57 passed

CI Status

GitHub Actions currently fails because this branch imports new QuantPlatformKit helpers from quant_platform_kit.common.runtime_config and quant_platform_kit.common.feature_snapshot_runtime, while CI still installs QuantPlatformKit main. This should be rerun after QuantPlatformKit PR #10 is merged.

Merge Order

Depends on QuantPlatformKit PR #10 and UsEquityStrategies PR #17.