[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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[chatgpt-codex-connector]

Restore the runner list under runs-on

In the monthly publish workflow, adding timeout-minutes at the same indentation as the empty runs-on: changes the YAML meaning: the runner labels are no longer assigned to runs-on and instead get folded into the timeout-minutes value (locally parsing this file yields runs-on: null and timeout-minutes: "60 - self-hosted - Linux - X64"). That makes the scheduled/manual monthly publish job invalid because GitHub Actions has no runner target and the timeout is not a number. Move timeout-minutes: 60 outside the runs-on block while keeping the self-hosted/Linux/X64 list under runs-on.

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