docs(codex): route authorised GitHub tasks through connector

[BigSimmo]

Summary

• make the authenticated GitHub connector/MCP tools the default remote control path for authorised GitHub work in Codex Cloud
• explicitly cover inline review-thread replies and resolution, Actions inspection/retry, and approved repository mutations
• retain the existing confirmation boundary and prohibit PAT or shell-credential workarounds

Validation

• documentation-only change
• repository rules require the PR's standard checks before merge

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📥 Commits

Reviewing files that changed from the base of the PR and between d106548 and 6230243.

📒 Files selected for processing (2)

• AGENTS.md
• docs/codex-cloud.md

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