[B3] Vec reverse iterators return wrong iterator type

[csparker247]

Summary

Vec::rbegin(), rend(), crbegin(), and crend() are declared to return iterator / const_iterator but must return reverse_iterator / const_reverse_iterator. This causes silent type mismatches and prevents correct reverse iteration.

Location

include/OpenABF/Vec.hpp lines 110–127.

Fix

Change the return types of all four methods to the appropriate reverse iterator types.

Dependencies

• Blocked by track T4 (write failing test first per TDD policy)

Conductor Track

B3