fix: resolve assertion error in C++ witness generation for scalar signals in loops

[DeVikingMark]

Fixes #374

Problem:
Assertion !(ctx->componentMemory[mySubcomponents[cmp_index_ref]].inputCounter) fails when scalar inputs are assigned before array signals in loops.

Root Cause:
Input signal analysis incorrectly marks signals as "Last" instead of "Unknown" when scalar signals are assigned before array signals in loops.

Solution:
Modified visit_address_type function to be more conservative in loop contexts:

• Changed condition from if found_unknown_address to if found_unknown_address || inside_loop
• Fixed field references in visit_loop and visit_create_cmp functions