Record the commit footer without emoji.

The git host rejects its notification row when a commit message contains the
robot emoji, so every push with the emoji footer logged a server error even
though the ref updated.

Generated with Codebuff
Co-Authored-By: Codebuff <noreply@codebuff.com>

newLang/AGENTS.md

@@ -107,3 +107,16 @@ A story is complete only when:
   requires a packaged artifact.
 - Prefer small, reviewable ca65 modules and deterministic test fixtures.
 
+## Commit Messages
+
+- End commit messages with this attribution footer, without emoji:
+
+  ```text
+  Generated with Codebuff
+  Co-Authored-By: Codebuff <noreply@codebuff.com>
+  ```
+
+  The git host fails to record its notification row when the message contains
+  the robot emoji, so the emoji form logs a server error on every push even
+  though the ref updates.
+