[spam][spam][spam] walking robot algorithm parts

[Undescribed Horrific Abuse, One Victim & Survivor of Many]

i linked some time ago to a small 4-legged walking robot i started
making during chemotherapy, when i was able to work on it for many
weeks. i didn't finish this. one next option was implementing an
algorithm for planning steps. my hands broke the controller and
refused to fix it as this developed.

it seems there's still value to writing this algorithm. it seems nice
to engage it a little.