Public onboarding, library initializer, and validation

[sfuchs-de]

Summary

• add decision-oriented public onboarding for demo, Pages hosting, desktop, and private sync
• add deterministic network-free research-library initialization and standalone validation commands
• document GitHub App, Render/Redis, coauthor, privacy, and AI-assisted research workflows
• add starter-library browser acceptance, documentation checks, and Render example validation
• publish version 0.1.1 after protected checks pass

Validation

• 935 Vitest tests
• 305 zero-retry Playwright scenarios across Chromium, WebKit, and mobile projects
• 29 Rust tests plus strict fmt and Clippy
• production web and API builds
• npm and Rust audits
• documentation-link, privacy, and generated-library checks