Agent READMEs

A README is the human's install decision: what this agent does for me, and what I must set up. It is not the agent's prompt (instructions.md, addressed to the agent). It carries only what is unique to this agent. Everything derivable the catalog page already renders, so repeating it is the slop to cut.

Shape

H1, a one-line outcome lead, then two sections:

# <Title>

<one sentence: the outcome the user gets>

## What it does

<the concrete checks or actions, and what you get back>

## Setup