The compact progress view no longer calls RenderStack, so the tree renderer
path was dead weight: Model.Renderer/RootBranch and the annotation-mutation
block in View, the StartSubmitMsg/SetSequentialMsg messages, URLStyle, and
the handler code that built the renderer (snapshotToStackTree, findRootBranch,
stack/fixedMap fields). SubmissionStartEvent.IsSequential is dropped too —
its only consumer was the dead SetSequentialMsg; the action still submits
new stacks sequentially internally. The storyboard submit stories now match
the compact view, and StackSnapshot stays intact as the action-layer contract.

Stack

• PR fix(submit): compact submit progress output #935
  • PR fix(submit): persist per-branch failures after the submit TUI exits #1189
    • PR refactor(submit): remove dead stack-tree rendering from submit TUI #1190 👈
      • PR fix(submit): persist the plan view when nothing is submitted #1194
        • PR fix(submit): tidy non-TTY submit output #1195
          • PR feat(submit): defer the submit TUI until the submission phase begins #1196
            • PR fix(submit): tighten submit output and surface swallowed warnings #1197
              • PR feat(submit): tailor submit output to stack shape #1270
                • PR feat(submit): group submit plan output #1271

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