Static GITHUB_PERMALINK_REGEX 

static GITHUB_PERMALINK_REGEX: LazyLock<Regex>

Regex pattern for matching GitHub permalink URLs.

Captures: owner, repo, commit, path, and optional line range fragment.

Supported patterns:

• https://github.com/{owner}/{repo}/blob/{commit}/{path}
• https://github.com/{owner}/{repo}/blob/{commit}/{path}#L{line}
• https://github.com/{owner}/{repo}/blob/{commit}/{path}#L{start}-L{end}