Make agent instruction for attribution broader. (pytorch#21139)

tiny change just to allow for any agent to which uses agents.md ->
claude.md to not start putting Claude in when using e.g. Codex.

Author: robell

CLAUDE.md

@@ -41,7 +41,7 @@ Details: [docs/source/using-executorch-building-from-source.md](docs/source/usin
 
 - Only commit when explicitly asked
 - No bullet lists of changes; explain review order for large PRs, or omit for small ones
-- Disclose PR was authored with Claude
+- Disclose PR was authored with AI, include tool name.
 
 ## Code Style