Multiple git hosts: support GitLab, Bitbucket, Azure DevOps, and self-hosted

[kasperjunge]

Summary

Extend agr to support git hosts beyond GitHub: GitLab, Bitbucket, Azure DevOps, GitHub Enterprise, and self-hosted git servers.

Why

Enterprise users often use internal git hosting. The existing [[source]] config with URL templates already provides the data model for this. The work is in ensuring the fetcher, authentication, and handle resolution all work across hosts.

Scope

• Extend source.py to support multiple host types with appropriate URL patterns
• Support authentication for each host (tokens, SSH keys)
• Update git.py to handle host-specific clone/checkout behavior
• Test with GitLab and Bitbucket at minimum
• Consider: auto-detection of host type from URL

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