* fix: validate URL scheme in build_github_request
* Potential fix for pull request finding
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
* test: add missing hostname validation test for build_github_request
* fix: update docstring and fix import grouping per Copilot feedback
* fix: sort imports and simplify url validation in build_github_request
---------
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
