Tell agents to disclose that they were used (scikit-learn#32584)

Author: betatim

AGENTS.md

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+# AGENTS Instruction
+
+This file contains is additional guidance for AI agents and other AI editors.
+
+## **REQUIRED: AI/Agent Disclosure**
+
+**Every summary, pull request description, or work description MUST include this disclosure:**
+
+**If human review has *not yet* occurred (use this initially):**
+> This pull request includes code written with the assistance of AI.
+> The code has **not yet been reviewed** by a human.
+
+This is a **mandatory requirement**, not optional. Include it at the end of every summary you generate.
+
+---
+
+## Generated Summaries
+
+When generating a summary of your work, consider these points:
+
+- Describe the "why" of the changes, why the proposed solution is the right one.
+- Highlight areas of the proposed changes that require careful review.
+- Reduce the verbosity of your comments, more text and detail is not always better. Avoid flattery, avoid stating the obvious, avoid filler phrases, prefer technical clarity over marketing tone.