Add helpful installation instructions when bd CLI is not found,
making it clear that the CLI must be installed separately.
Changes:
- Add BdNotFoundError.installation_message() with clear install steps
- Update all BdNotFoundError raises to use new formatted message
- Improve config error message with installation instructions first
- Update tests to match new error message format
Error message now shows:
- Clear explanation that bd CLI is required
- Installation command with curl one-liner
- Link to GitHub installation docs
- Reminder to restart Claude Code after installation
Test results: 90/91 tests passing (1 unrelated path assertion)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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