Implement Skill Quick Ref: Execute single issue end-to-end. Output: code changes + commit + closed issue. YOU MUST EXECUTE THIS WORKFLOW. Do not just describe it. Execute a single issue from start to finish. Codex Lifecycle Guard When this skill runs in Codex hookless mode ( is set or is ), ensure startup context before claiming or implementing the issue: is the single startup guard for Codex skills. It records startup once per thread and skips duplicate startup automatically. Leave to dedicated closeout skills such as , , or . Execution Steps Given : Step 0: Pre-Flight Checks (Resume + Gates…