Removes the Completed Steps section: dated accounts of finished work,
review and merge history, and notes on past decisions. Git keeps the
history. Status, Next Step and Future Steps are unchanged.
The Workflow step "move Next Step to the top of Completed Steps" now
reads "delete Next Step from `TODO.md`", the standard wording. The
`README.md` TODO section no longer calls `TODO.md` the work log; it
says the file holds the next step and the steps planned.
Model: opus-5-5
sneak