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319319# - init+fetch checkouts (runner default: only FETCH_HEAD exists)
320320# - clone-based checkouts (origin/* exist)
321321# - the runner default: the child starts on the session's outcome
322# branch, which the runner creates with checkout -B after checkout
322# branch, which the runner creates after checkout
323323# - detached HEAD, when a custom setup skips that branch creation
324324# With no reference point at all (never fetched), stay silent rather
325325# than false-positive on a read-only turn.