Let the tool coordinator close a prompt it no longer needs

Todo2026-10-24jp

client: clipackage: jp_cli, jp_inquiretype: follow-up

A tool call can be settled while its approval, question, or result-review prompt is still on screen. Two paths reach that state:

• The Host loses its connection to the JP MCP Server while another call's prompt is open. Every unsettled call is recorded as lost at once.
• A client driving the turn from outside the process stops or restarts the calls while a local prompt is open. ToolCoordinator::finish applies client interrupts even while a prompt is active, and abandon_parked settles calls parked in Wait::Approval or Wait::Review.

finish waits for an open prompt before it hands the calls back, and an answer given after its call was settled is ignored (PR #1247). Nothing is lost, but the user still has to answer a prompt for a call that is already decided before the turn can end.

The prompts run in spawn_blocking through ToolPrompter and PromptBackend (inline_select, inline_reply, select, password), and none of them can be stopped from outside. Closing a prompt the coordinator no longer needs would take:

• A cancellation token on each PromptBackend method, threaded through ToolPrompter and every test backend.
• Widgets that poll for input and check the token. InlineSelect blocks inside inquire's CustomType::prompt_with_writer, which appears to have no external abort; confirm that against inquire's source before choosing between replacing the widget and wrapping it. inline_reply is our own widget.
• Terminal cleanup when a prompt is stopped part-way: leave raw mode and erase the partly drawn prompt.
• A decision for the $EDITOR path behind result editing, which can only be stopped by ending the editor process.

The wait in finish stays either way: a cancelled prompt still reports back from its blocking task, and the coordinator has to receive that before the batch goes away.

Done when a call settled while its prompt is open closes that prompt without user input, the terminal is left clean, and a test shows finish returning without an answer being sent.