docs(cli): cover AskQuestion tool behavior and TUI interaction

[siewcapital]

Summary

• document the AskQuestion built-in in docs/cli/tool-permissions.mdx, including parameters and default permission behavior
• add a new TUI section describing how question prompts work (arrow-key selection, custom typed answers, and default answer behavior)
• update read-only tool examples in CLI docs so AskQuestion is explicitly included

Why

Issue #11153 requested docs for the AskQuestion tool and how users interact with it in TUI mode. This update adds those details in the two suggested CLI docs pages.

Closes #11153

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Summary by cubic

Documents the AskQuestion tool and interactive prompts in CLI TUI mode, addressing #11153. Adds tool parameters and default permission behavior, expands read-only defaults (including AskQuestion), and explains arrow-key selection, typing custom answers, and default answer submission.

^{Written for commit 0113023. Summary will update on new commits.}

[github-actions]

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[cubic-dev-ai]

No issues found across 2 files