The go-unit-tests hook caps every package at 30s and re-runs the whole module
once per file batch, so the git-fixture tests in cmd/agentws timed out as soon
as they grew.
- Replace go-unit-tests with a module-level `go test ./...` local hook
`agentws new --branch` always forked from the base branch, so a worktree for a
branch that already existed on origin started at the base's HEAD with none of
the branch's commits, and callers had to reset --hard afterwards to recover.
- Check out an existing origin/<branch> and set the branch to track it
- Fast-forward a stale local branch onto origin, keeping unpushed commits
- Fork from --from or the remote default only when origin lacks the branch
- Name which of the two paths was taken in the command's output
- Ignore --from, with a note, when the branch is already on origin
unkin-agent