When bd cook encounters a circular extends chain (A extends B extends A),
the error message now shows the full chain: "cycle-a -> cycle-b -> cycle-a"
instead of just "circular extends detected: cycle-a".
This makes debugging circular dependencies much easier by showing exactly
which formulas are involved in the cycle.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
127a36dd5f