IndirectY addressing mode missing page boundary cycle handling

[wfd3]

Description

The IndirectY (Indirect Indexed) addressing mode doesn't check for page boundary crossings, but according to 6502 specifications, it should add an extra cycle when the indexed address crosses a page boundary.

Location

6502/6502.cc:397-400

Current Code

case AddressingMode::IndirectY:
    address = readByteAtPC();
    address = readWord(address) + Y;
    break;

Expected Behavior

Similar to AbsoluteX and AbsoluteY modes (lines 376-387), the IndirectY mode should:

1. Check if adding Y to the base address crosses a page boundary
2. Add an extra cycle if the PageBoundary flag is set for the instruction

Impact

This affects cycle-accurate emulation for instructions using IndirectY addressing mode.

Reference

See how AbsoluteX/AbsoluteY use the updateCycles() lambda to handle this.