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 so it can ask clarifying questions and capture user answers before proceeding. Users can choose from options or type a custom answer; prompt behavior and copy refined, and the old allowCustomAnswer flag is removed.

• New Features
  • QuizService: event-driven ask/answer with pending state.
  • AskQuestion built-in tool (readonly) with options and default answer; no allowCustomAnswer param; returns normalized reply.
  • QuizPrompt TUI: arrow-key selection or typed answers with clearer hints; integrated into Chat; input disabled during active question.
  • useChat: listens for quiz events, exposes activeQuizQuestion, and handles answers; wired through TUIChat and ScreenContent.
  • Registered quiz service; added tool to ALL_BUILT_IN_TOOLS/BUILT_IN_TOOL_NAMES.
  • Default policies updated to allow AskQuestion in default and plan modes.

^{Written for commit 3572509. Summary will update on new commits.}

[cubic-dev-ai]

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