gig: TODO_GIG is a card you can read at 18:00, not a week of notes

1101 lines of diagnosis had accumulated on top of each other, oldest first,
so the only live content — tonight's clock and the four things left to do —
sat at the very bottom under forty headings dated Sunday. A checklist you
have to scroll to is not a checklist.

Rewritten as one screen: the clock, five numbered actions in the order they
happen, four symptom-to-fix recoveries, four things never to run tonight,
and the measured rig state. Short lines, plain words, no jargon that needs
a lookup at showtime.

The week's notes are not lost and not duplicated — the file's own footer
carries `git show 50adcf43:TODO_GIG.md`, verified to restore it byte-exact.