`git clone` only accepts the bare repo URL, but users routinely paste URLs
they copied from a browser tab (`tree/`, `blob/`, `pull/`, `commit/`,
`releases/`, `issues/`, etc.). Previously every such URL was passed
verbatim to `git clone` and failed with `repository not found`.
`_resolve_git_url()` now normalizes `https://github.com/{owner}/{repo}/<browser-segment>/...`
down to `https://github.com/{owner}/{repo}.git` before handing off to git.
Non-github hosts (gitlab, bitbucket, custom), SSH/file URLs, and the bare
`https://github.com/owner/repo` form are all returned unchanged.
Cline shipped the same UX concept for single-file plugins from blob URLs
in cline#10945; hermes-agent plugins are directory-based, so this port
is restricted to the URL-normalization piece that applies to our model.
teknium1
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