Implement formula plumbing unit#924

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MassiveBattlebotsFan wants to merge 9 commits intoMEGA65:developmentfrom

MassiveBattlebotsFan:math_unit_bringup

Commits on Oct 28, 2025

hypothetically enabled the math unit
MassiveBattlebotsFan
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actually enabled the math unit
MassiveBattlebotsFan
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modified the phasing, fixed a bug that broke STQ when writing to the math registers
MassiveBattlebotsFan
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forgot to replace all instances of reg_math_cycle_counter_reset
MassiveBattlebotsFan
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implemented dividers, implemented some experimental stuff to allow for inverting input B instead of making every other unit a subtractor
MassiveBattlebotsFan
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implemented new latching system
MassiveBattlebotsFan
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implemented divider multiply mode, fixed dividers not restarting correctly sometimes. this commit occasionally has multi-driven net errors with math_unit_flags, for whatever reason.
MassiveBattlebotsFan
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fixed divider multiplier mode not being signed, added byte shift option
MassiveBattlebotsFan
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Removed a bunch of commented-out code, and cleaned up formatting for divider32, multiply32, and shifter32.
MassiveBattlebotsFan
committed