feat(cli): quiz answers

[uinstinct]

Description

Introduce quiz to ask clarifying questions in the cli.

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Checklist

• [] I've read the contributing guide
• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

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Summary by cubic

Adds an interactive quiz flow to the CLI to ask clarifying questions before proceeding. Users can select from options or type a custom answer; prompt copy refined and the old allowCustomAnswer flag is removed.

• New Features
  • QuizService: event-driven ask/answer with pending state; moved under services, registered via ServiceContainer (services.quiz).
  • AskQuestion tool (readonly): question, options[], defaultAnswer; no allowCustomAnswer; returns normalized reply.
  • QuizPrompt TUI: arrow-key selection or typed answers with default hint; input disabled during an active question.
  • useChat: listens for quiz events, exposes activeQuizQuestion, handleQuizAnswer; wired through TUIChat, ScreenContent, and ChatScreenContent.
  • Tools: AskQuestion added to ALL_BUILT_IN_TOOLS and BUILT_IN_TOOL_NAMES.
  • Policies: default and plan modes allow AskQuestion.

^{Written for commit 9ae00f5. Summary will update on new commits.}

[cubic-dev-ai]

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