Add Craps Roguelike lab: design doc, content pages, and Svelte prototype

[tphummel]

Motivation

• Introduce a new "Craps Roguelike" lab to prototype a run-/stage-based game built on the existing node-craps simulator.
• Provide a concrete design specification for the loop, domain model, and testing approach to avoid coupling UI to engine internals.
• Ship a minimal static Svelte prototype to exercise the run/stage loop, deterministic hooks, transcript, and local run history.

Description

• Add site navigation and lab pages by updating content/experiments.md and creating content/lab/_index.md and content/lab/craps-roguelike/_index.md.
• Add a comprehensive design document content/lab/craps-roguelike/design.md that defines the domain model, FSM states, engine interface, loop algorithm, UX, storage plan, and a testing strategy.
• Add a static Svelte prototype under static/craps-roguelike/ including App.svelte (implements a mock engine, run/stage loop, deterministic roll sequence input, transcript, local localStorage history, and export) and index.html (loads and compiles the Svelte component in the browser).

Testing

• No automated tests were added or executed as part of this change.
• A detailed automated test plan is included in content/lab/craps-roguelike/design.md that outlines unit and integration tests, fake-engine patterns, and storage/export validation to be implemented in follow-ups.

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