[codex] Apply audit remediation

[Pigbibi]

Summary

• apply the 2026-06-10 audit remediation items
• tighten GitHub workflow permissions, job timeouts, and scheduled/manual concurrency where applicable
• add focused characterization or governance checks where this repository has runtime-facing changes

Validation

• targeted local tests and lint checks were run before publishing
• workflow governance scan passed across the remediation scope
• git diff --check passed across the remediation scope

See local audit report: QuantStrategyLab-review-2026-06-10.md.

[chatgpt-codex-connector]

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Reviewed commit: 1872801637

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[chatgpt-codex-connector]

Limit Ruff to this repository

I checked python -m ruff check --help, which says ruff check [FILES] runs on the given files or directories and defaults to .. Because this workflow checks out QuantPlatformKit under external/QuantPlatformKit before this step, ruff check . will also lint that external repository; any lint/config change there can fail HkEquityStrategies CI even when this repo's code is fine. Scope Ruff to the local paths, or exclude external/.

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