Two fixes:
1. `bd init` chaining was broken - the code referenced `.old` hooks but
never actually renamed the existing hooks. Added the missing os.Rename().
2. `bd hooks install` now supports --chain flag to chain with existing hooks
(e.g., pre-commit framework). When used, existing hooks are renamed to
.old and bd hooks run will call them before the bd logic.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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