[feat] [sdk] zod to arktype

[mocayo]

Summary

• Replace zod with arktype for schema validation in @cozeloop/langchain and @cozeloop/ci-tools packages
• Improve README documentation for both packages:
  • ci-tools: Fix typos (po name → repo name, wrong GitHub event path), improve markdown formatting (table alignment, list styling, bare URL fixes)
  • cozeloop-langchain: Rewrite with clearer structure, add Features section, improve code examples with real imports (ChatOpenAI)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
- Coverage   90.90%   90.69%   -0.22%     
==========================================
  Files          60       60              
  Lines        3507     3524      +17     
  Branches      813      815       +2     
==========================================
+ Hits         3188     3196       +8     
- Misses        316      325       +9     
  Partials        3        3              

Components	Coverage Δ
@cozeloop/ai	94.15% <ø> (ø)
@cozeloop/langchain	82.27% <100.00%> (-0.60%)	⬇️

Files with missing lines	Coverage Δ
packages/cozeloop-langchain/src/otel/index.ts	100.00% <ø> (ø)
packages/cozeloop-langchain/src/otel/schema.ts	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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