codeSplitters repo storage: binary files on branches, dig up one folder, page the log API, desktop as primary store #738

The git and storage plumbing under repos and branches.

One agent can take this whole bundle. The original issues are closed into it and keep their full details.

• codeSplitters branches: carry binary files (a blob-backed branch copy) #446 codeSplitters branches: carry binary files (a blob-backed branch copy)
• codeSplitters: dig up one folder of a repo (e.g. RustyBuns apps/example) #381 codeSplitters: dig up one folder of a repo (e.g. RustyBuns apps/example)
• codeSplitters scale: page the file log API with a limit and next cursor #719 codeSplitters scale: page the file log API with a limit and next cursor
• codeSplitters desktop: the primary git store, local out and GitHub in #464 codeSplitters desktop: the primary git store, local out and GitHub in

Order: #719 and #381 are small and self-contained. #446 is medium. #464 is the big one and could be its own PR.

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