chore: unify README under Smoo AI brand and voice

[brentrager]

Rewrites the README with the standard Smoo AI branded header (logo, tagline, flat-square brand-color badges), the "Part of Smoo AI" section, and the footer line, in the shared brand voice. All real technical content (multi-language install table, resilience feature lists, smart defaults, the full examples gallery, @smooai/logger integration, license) is preserved — restructured and rephrased only.

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