Three P1 adoption-wave findings, all of which break an unattended run.
The worktree needs make build-frontend and make testdata once before its
first push — the pre-push go-test hook embeds frontend/dist and the
fixture library and refused the push without them. The merge leg now
says to fetch origin/main in the same breath as the refresh merge: a
cached origin/main merged against the wrong base, CI went green on it,
and the merge came back 405 "behind base" — a full cycle wasted. And a
killed fetch leaves 0-byte objects in the shared store whose signature
(error: object file … is empty / unpack-objects failed) must halt the
loop for a human instead of churning, with the repair recipe written
down.
Closes#240
logan