[codex] Align LongBridge strategy runtime contracts

[Pigbibi]

Summary

• use shared QuantPlatformKit runtime config and feature-snapshot evaluation helpers
• move the tech strategy single-day execution window into the strategy runtime policy
• make switch-plan and Cloud Run env sync consume config_source_policy and manifest requirements
• default bundled_or_env profiles to packaged canonical config unless an env override is explicitly set

Why

LongBridge should keep broker/session/execution concerns local while strategy artifact, config, and runtime policy requirements come from the shared strategy contract.

Validation

• .venv/bin/python -m pytest tests/test_strategy_runtime.py tests/test_runtime_config_support.py tests/test_strategy_loader.py -> 43 passed
• .venv/bin/python -m ruff check strategy_runtime.py runtime_config_support.py scripts/print_strategy_switch_env_plan.py tests/test_strategy_runtime.py tests/test_runtime_config_support.py -> passed
• bash tests/test_sync_cloud_run_env_workflow.sh -> 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.