feat: add Clone Interview command

[Turtle-Hwan]

Summary

• Add /clone:interview for Claude and clone-interview for Codex to clarify requirements into a local spec before coding.
• Add Clone Interview v1 auto-answering: interview questions are predicted through Clone MCP, auto-recorded above threshold, and escalated to the user when confidence is low.
• Add Claude AskUserQuestion hook support, Codex skill-driven prediction flow, docs, release automation coverage, and tests.

Test Plan

• pnpm test
• claude plugin validate .
• git diff --check

Notes

• V1 keeps question generation plugin-side: the agent asks the interview questions, Clone predicts how the user would answer.
• Dedicated backend interview/seed/evaluate tools remain a v2 direction.