Review the code of MIL-002 against QC-PY-001: 12 of 13 criteria apply and all
pass, criterion 10 is N-A (no Design Class Diagram). Verdict Go, confirmed by
S01. That is the last Go criterion of MIL-002.
Two decisions stay open and do not block the verdict: the tests need a display
for Tk, and a few pale palette colours are faint on the white background.
Closes#13
Task: MIL-002#7