Sprites tasks committed straight onto the chosen base branch because
SpritesPreparer didn't populate WorktreeBranch and the orchestrator's
"forward env.WorktreeBranch on reuse" check only fired for Docker.
Mirror the Docker preparer's TaskBranchName generation in Sprites,
extract a shared `nonWorktreeTaskBranch` helper that uses a
deterministic suffix derived from the task ID (so legacy env rows that
predate this change resolve to the same branch on every resume), and
let the orchestrator forward env.WorktreeBranch for any clone-based
executor — Docker or Sprites.
José Almeida
9012698172