Summary

• implement the built-in question tool through Form.Service
• interrupt runner continuation when a form-backed question is cancelled
• remove redundant QuestionV2 TUI state and rendering while retaining the public compatibility accessor

Stack

• Depends on feat(tui): render session forms #35421
• Followed by fix(tui): scope global forms by location #35423

Tests

• bun test test/tool-question.test.ts (4 pass)
• bun test test/session-runner.test.ts -t "interrupts runner continuation when a form is cancelled" (1 pass)
• bun test test/cli/tui/data.test.tsx test/cli/cmd/tui/notifications.test.ts (26 pass)