Keep AGENTS.md as the single source of agent docs: agents-sync runs
before every Bash command and makes each directory canonical —
AGENTS.md real file, CLAUDE.md a symlink to it. Renames a lone
CLAUDE.md, creates or re-points symlinks, replaces identical
duplicates; differing files are only reported, never merged. Fails
open so it can never block a command.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>