Initialize calm game project

AGENTS.md

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+# AGENTS.md
+
+SvelteKit + TypeScript family quiz game.
+
+This file is the durable project contract for AI coding agents. Keep reusable
+agent workflow guidance here or under `development/_reference/ai/`.
+
+## Workflow
+
+- Codex is the orchestrator, verifier, reviewer, and committer.
+- Use `npm run agent:loop -- --task "<concrete task>"` when Codex delegates
+  implementation to the Pi worker harness.
+- Worker agents receive one concrete task. They must not broaden scope, commit,
+  push, deploy, rewrite git history, or edit agent workflow files unless the task
+  explicitly asks.
+- Progress is captured through reviewed git checkpoint commits, not through
+  long-lived execution logs.
+- Technical run artifacts live in `.codex/logs/agent-runs/` and are ignored.
+
+## Verification
+
+Run the narrowest relevant checks after changes:
+
+- `npm run check` for Svelte/TypeScript changes.
+- `npm run build` for production-build confidence.
+- Use a real local browser smoke for visible UI behavior changes.
+
+Never claim work is done until there is a code diff and observed verification.
+
+## Project Shape
+
+- `src/lib/types.ts` holds domain types.
+- `src/lib/question-sets/` holds question data.
+- `src/lib/stores/game.ts` owns game state and localStorage persistence.
+- `src/lib/components/` holds UI components.
+- `src/routes/+page.svelte` orchestrates screens.
+
+## Product Rules
+
+- Keep the game calm, family-friendly, and host-led.
+- Preserve the separation between question data, state, and UI.
+- Do not add backend, auth, database, multiplayer, or an editor unless explicitly
+  requested.
+- Keep user-facing copy consistent with the language and tone of the touched UI.
+- Prefer small, focused changes and checkpoint commits.