Feat/configurable GitHub query limits

[ShashwatUpadhayay]

Summary

• Make GitHub query limits configurable through environment variables:
  • GITHUB_REPO_COUNT
  • GITHUB_PR_COUNT
  • GITHUB_ISSUE_COUNT
  • GITHUB_DISCUSSION_COUNT
• Add parsing and validation with sensible defaults and upper bounds
• Replace hardcoded query limits with runtime configuration
• Document the new environment variables
• Add unit tests for parsing and validation logic

Testing

• Verified default values are used when environment variables are missing or invalid
• Verified valid values are parsed correctly
• Verified oversized values are clamped to the configured maximum
• Ran the test suite successfully

[vercel]

@ShashwatUpadhayay is attempting to deploy a commit to the osama's projects Team on Vercel.

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[github-actions]

Thank you for the pull request! ✅

A maintainer will review this soon. Please be patient while we take a look. 🙌