## Why

The current repository creation flow creates mirrored bare repositories for clone-based repos. That breaks the workspace model because the UI and file editing features expect a normal working clone with an initial branch, remote tracking, and pull/fetch behavior that works from a checked-out branch.

## What Changes

- Create clone-based repositories as normal working clones instead of mirrors
- Initialize blank repositories as working clones with an initial branch when needed
- Ensure newly created repos have a usable current branch for workspace browsing and commits
- Update pull semantics to use the current tracked branch when available
- Keep fetch behavior available for remote-synced repositories

## Impact

- Backend: repository creation and git control helpers
- Backend tests: clone, pull, and empty-repo branch behavior
- Frontend: no intentional UX change beyond sync behavior becoming reliable
