[codex] Add IBKR HK low-vol dividend switch plan

[Pigbibi]

Summary

• Enable IBKR switch-plan support for hk_low_vol_dividend_quality.
• Update HK strategy dependency to the runtime/evidence-gated HK strategy commit.
• Add factor snapshot artifact filename hints for snapshot-backed factor contracts.
• Preserve dry-run-first behavior with required feature snapshot path and manifest placeholders.
• Carry latest main runtime guard / heartbeat changes into the branch.

Validation

• .venv/bin/python -m pytest -q tests/test_runtime_config_support.py tests/test_request_handling.py tests/test_strategy_runtime.py -> 99 passed
• Switch plan smoke confirms hk_low_vol_dividend_quality True feature_snapshot <required> and factor snapshot artifact hints.

Dependency / merge order

• Depends on [codex] Enable HK low-vol dividend quality runtime HkEquityStrategies#13.
• After HK strategy PR merges and a release tag is created, update this dependency from commit SHA to tag before final merge if repository convention requires tags.

Notes

• This PR does not change production Cloud Run directly.
• Real order enablement remains blocked until production factor snapshot, manifest, lineage, dry-run preview, notification log, and operator approval evidence pass validation.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Pin the HK strategy dependency to an immutable ref

Because this now points hk-equity-strategies at a branch name, any later pip install -r requirements.txt or Cloud Run build can pick up whatever commit that branch has moved to rather than the runtime adapter/version validated by this change. The other strategy deps are pinned to tags and the previous HK dep was pinned to a SHA, so for rollout reproducibility this should use an immutable tag or commit SHA once the HK low-vol adapter is selected.

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