Use native Request objects in signing examples

[timkelty]

Summary

• construct native Request objects before generating signature headers
• send the same signed request object so @target-uri matches the normalized URL
• clone requests in the native retry helper so POST bodies can be retried
• recommend URL.searchParams for encoding query parameters

Testing

• git diff --check
• verified native Request URL normalization matches the sent URL
• verified cloned POST requests preserve their body across a retry

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-16T01:48:01.939954Z	9df7574	PR opened

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