Verified: max-turns hints, usage pill/modal, list-handler run end to end.
New findings: NumericUpDown null binding throws in the settings modal, the
verify gate is skipped for worktree-less tasks and unhandled in two of three
merge entry points, the handoff leaves an empty pane, worktree cleanup logs
already-done as WARN, orphaned git worktrees are invisible to the app, modal
bodies are clipped at the bottom, usage tables need formatting work.