-max cookbook improvements - reduce duplication, clarify priorities

[bculleec]

Summary

This PR refactors and tightens the Codex CLI prompting guide to reduce duplication, clarify priority rules, and improve internal consistency. The goal is to make the guidance easier to apply in practice while preserving its intent: an autonomous, action-oriented coding agent that delivers correct, end-to-end results.

Motivation

The previous version of the guide contained overlapping directives, repeated principles, and ambiguous priority relationships. These changes streamline the structure, collapse redundant guidance, and clarify ownership, execution flow, and tool usage expectations. This improves readability, predictability, and long-term maintainability of the cookbook.

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