[WIP] Fix inconsistency in reason.prompt.md chain-of-thought description

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

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This section details on the original issue you should resolve

<issue_title>reason.prompt.md is described here as showing explicit chain-of-thought steps to the user, but reason.prompt.md currently uses agent: agi-reasoning and that agent’s front-matter description now says chain-of-thought is not exposed. This is internally inconsistent and may mislead users/tool routing. Consider either (a) adjusting this prompt list entry to match the agent’s behavior, or (b) splitting into two agents (hidden-CoT vs visible-reasoning) and pointing reason.prompt.md at the visible one.</issue_title>
<issue_description>reason.prompt.md is described here as showing explicit chain-of-thought steps to the user, but reason.prompt.md currently uses agent: agi-reasoning and that agent’s front-matter description now says chain-of-thought is not exposed. This is internally inconsistent and may mislead users/tool routing. Consider either (a) adjusting this prompt list entry to match the agent’s behavior, or (b) splitting into two agents (hidden-CoT vs visible-reasoning) and pointing reason.prompt.md at the visible one.

Originally posted by @copilot in #164 (comment)</issue_description>

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