docs: publish universal adoption guidance

[okyrychenko-dev]

Summary

• add a confirmation-first adoption path covering typed custom modals, handles, registries, renderers, animations, provider isolation, and SSR/RSC integration
• add a package-consumer typecheck example using the current public exports
• document provider ownership and registry routing semantics
• link the corresponding Storybook examples
• update package-cost figures from the latest reproducible checks

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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