v1 coverage-audit slice b2. The audit found list_sessions had no
caller — the startup session picker (design-brief §4) was never built;
bare TUI mode was a hard usage error. Add SessionPickerApp (mirrors
AgentPickerApp) and resolve bare mode in _resolve_then_run.
- Bare TUI mode (no --session/--new) now valid → session picker.
Resolution: 0 sessions -> [no_sessions] exit 14 (resume-only per
§4 "no in-app creation, --new only"); exactly 1 -> auto-resume
(§4 "picker only when >1"); >=2 -> SessionPickerApp -> resume pick
(Esc/Ctrl-D -> exit 0).
- cli._parse: bare TUI valid; --send still requires one flag; --agent
forbidden in bare mode. run_tui PRE-002 xor -> mutually-exclusive.
- Contract #6 amended (SessionPickerApp + bare-mode resolution) +
validated. TDD: 3 picker pilot tests + 5 resolution tests + 3 cli
validation tests. Suite 528 green; touched code ruff-clean.
Design note: bare + 0 sessions errors (honors §4's no-in-app-creation
clause); the friendlier auto-fall-through-to-new is deferred pending
operator preference.
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