revert: update agent guidelines on contributions

This reverts commit a3db36b.

Signed-off-by: Rello <github@scherello.de>

Assisted-by: Codex:GPT-5

Author: Rello

AGENTS.md

@@ -38,7 +38,9 @@ All contributions generated or assisted by this agent must fully comply with:
 ### What this agent must never do
 
 - Open issues, submit pull requests, post review comments, or send security reports autonomously. Every contribution must be reviewed and submitted by a human.
+- Add `Signed-off-by` tags to commits. Only the human contributor can certify the Developer Certificate of Origin.
 - Generate or submit security reports without independent human verification. Report verified vulnerabilities via [HackerOne](https://hackerone.com/nextcloud), not as GitHub issues.
+- Write PR descriptions, review comments, or issue reports on behalf of the contributor. These must be in the contributor's own words.
 - Fully automate the resolution of issues labeled [`good first issue`](https://github.com/issues?q=org%3Anextcloud+label%3A%22good+first+issue%22) or similar beginner-friendly labels.
 - Submit code that has not been reviewed and cleaned up by the contributor. Dead code, redundant logic, excessive comments, and unrelated changes must be removed before submission.