Move Removed Helper Functions to libindigo-ffi

[chrsoo]

Priority: Medium
Labels: technical-debt, area:ffi, priority:medium, refactoring

Description:
Helper functions removed from core should be moved to libindigo-ffi where they belong.

Source: Item #22 from consolidated analysis
Files: FFI crate, helper utilities

Acceptance Criteria:

• Helper functions identified
• Functions moved to libindigo-ffi
• Tests updated
• Documentation updated
• No breaking changes

Related Issues: #23 (Interface enum)