A full pass over what submit prints, in both TTY and line-by-line modes:

• Route PR create/update warnings (failed labels, reviewers, assignees)
  through a new BranchWarningEvent. They previously went straight to the
  console, which the runner quiets while the TUI is active, so in
  interactive mode they were silently dropped. The TUI now renders them
  under the progress rows and persists them on exit.
• Replace CompletionEvent.Success with a typed Outcome (complete,
  up-to-date, dry-run, canceled, nothing-to-submit, failed) so handlers
  stop string-matching "Submit complete". Failure outcomes print nothing
  extra — the returned error already reaches the user — which removes the
  duplicate "Submit failed" line.
• Rework validation output: the fallen-behind-trunk note is now a warning
  with a remedy; the empty-branch warning block (which listed branches the
  plan re-listed and asked a question it never prompted for) is folded into
  the plan as a dim (empty) annotation, with a real confirm prompt in
  interactive runs; the merged/closed tip now follows the warning instead
  of preceding it.
• Plan lines show the PR number for updates (branch -> update fix(submit): persist per-branch failures after the submit TUI exits #1189 ), the
  update-only skip reason drops the redundant "skipped," prefix, and
  --confirm states what it will do ("Create 2 and update 1 PRs?").
• Done lines keep the verb next to the ref ("fix(submit): persist per-branch failures after the submit TUI exits #1189 created"), so an
  unexpected create is visible at a glance. Non-TTY output drops the
  transitional "Creating..." lines; only terminal states print.
• The persisted TTY summary renders each PR as an OSC 8 hyperlink (one
  clickable line per PR). Non-TTY output keeps raw two-line URLs so logs
  stay greppable. The TUI header no longer round-trips through a global
  message string.

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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