v0.3.28

What's Changed

• docs: redesign docs.atomicmail.ai + SEO (canonical, OG, sitemap, llms.txt) by @supersayin07 in #56
• docs: clean URLs + serve /index.md for agents (follow-up to #56) by @supersayin07 in #57
• docs: serve /index.md for agents (fixes 404) — follow-up to #57 by @supersayin07 in #58
• docs: add Google tag (gtag.js) to all docs pages by @supersayin07 in #62
• Add Pydantic AI integration package (port of #59 to main) by @kondaevama in #61

Full Changelog: v0.3.27...v0.3.28