Scaffold CLI: npx create-claudius

[PAMulligan]

Goal

Deliver a one-command starter (npx create-claudius) that drops an integrated Claudius widget plus example backend wiring into a fresh or existing repo.

Acceptance criteria

• CLI generates project skeleton with widget + worker config
• Prompts for: framework, deploy target, theme defaults
• Generates .env.example with required vars listed
• Runs pnpm install and prints next steps
• Smoke test in CI on macOS, Linux, Windows runners

Milestone

v1.2.0