TODO.md: open work only (closes #235)

Removes the Completed Steps section: dated accounts of finished work,
review and merge history, and notes on past decisions. Git keeps the
history. The Workflow, Status, Next Step and Future Steps sections are
unchanged.

Model: opus-5-5

README.md

@@ -1935,7 +1935,8 @@ These apply to people and to coding agents alike.
 
 ## TODO
 
-`TODO.md` in the repo root holds the next step and the steps planned. Open now:
+`TODO.md` in the repo root is the work log: the next step, the steps done and
+the steps planned. Open now:
 
 - [ ] Check quak against a live Ente account. This needs an account only sneak
       has.

TODO.md

@@ -2,7 +2,7 @@
 
 - branch from `next`
 - do the work in Next Step
-- delete Next Step from `TODO.md`
+- move Next Step to the top of Completed Steps
 - move the top item of Future Steps into Next Step
 - commit (`TODO.md` changes in the same commit as the work)
 - push