codeSplitters: dig up one folder of a repo (e.g. RustyBuns apps/example) #381

A pasted URL like github.com/QuinnsCode/RustyBuns/tree/main/apps/example digs up the whole repo, because parseRepo drops the /tree/<branch>/<path> part. Digging up just that folder would mean importing the repo, then pushing a new root commit with only that subtree (we have the tree-rewrite pieces from the tarball/fresh-start code).

Related: a dig over the 40 MB import cap still uses the GitHub API (commits + tarball) with no token, so it can hit the same 403 that #377 fixes for normal digs. That could use codeload.github.com instead, or a GITHUB_TOKEN secret could be set through varlock.

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