atproto utils for zig zat.dev
atproto sdk zig

docs: explain ATProto doc publishing in readme master

the readme now explains that zat publishes its own docs as site.standard.document records - dogfooding the protocol. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>


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