PRD 0020 chunk 1. `cli/start.py`'s `_launch_bottle` did three
things in one function: prepare + preflight, attach claude, and
settle state on teardown. Split them so the dashboard (PRD 0020
chunk 2+) can reuse the prepare + attach pieces piecewise
without going through the CLI's one-shot orchestrator:
- `prepare_with_preflight(spec, *, stage_dir, render_preflight,
prompt_yes, dry_run)` — injects render + prompt callables so
the CLI binds them to stderr/stdin while the dashboard binds
them to a curses modal. Returns `(plan, identity)`; identity
is set after `backend.prepare` returns so callers can reap
the prepare-time state dir on abort via `settle_state` in
their finally — preserving today's preflight-N cleanup.
- `attach_claude(bottle, *, remote_control)` — runs claude
inside the bottle and returns its exit code. The dashboard
calls this from inside a `curses.endwin` → … →
`stdscr.refresh()` handoff.
- `capture_session_state` / `settle_state` lose their leading
underscore; the dashboard will call them on
session-end + explicit-stop respectively.
`_launch_bottle` becomes a thin orchestrator over those helpers.
No behavior change; all 453 unit tests pass and `./cli.py start
implementer --dry-run` produces identical preflight output.
didericis
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