preflight: scaffold + context files

interview-agent/CLAUDE.md

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+# CLAUDE.md
+
+This project uses `AGENTS.md` instead of a `CLAUDE.md` file.
+
+Please see @AGENTS.md in this same directory and treat its content as the primary reference for this project.
+
+## Claude Code workflow (this repo)
+
+In addition to AGENTS.md:
+
+- **Model:** run `/model opusplan` — Opus 4.8 reasons during plan mode, Sonnet 4.6 executes.
+- **Plan mode:** for any multi-file or design change (e.g. the two-stage handoff refactor), enter plan mode (Shift+Tab) and present the plan for approval **before** editing files.
+- **Reviewing the developer's hand-written fallback:** switch to plain `/model opus` for that turn — `opusplan` uses Opus only in plan mode, and a code review is not plan mode. Switch back afterward.
+- **Verify** LiveKit APIs via the LiveKit docs (CLI/MCP) before writing code, per AGENTS.md.
+- **Commit** at each checkpoint with the message the developer specifies.
+
+Reminder: do not author the time-based fallback logic (see AGENTS.md). The developer owns that part.