Archive remote output branches without creating local heads - #125
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ProjectRepo.copy_data_to_cache(branch)avoided checking out the output branch, but it still created a local branch when the requested result only existed asorigin/<branch>. That meant loading cached data could still mutate local Git refs.This PR changes the cache path to archive the remote ref directly. If branch exists locally, it still archives the local branch. If it does not exist locally, it archives
origin/<branch>directly without creating a local head.The regression test sets up a result branch that only exists as a remote-tracking ref, calls
copy_data_to_cache(), and checks that the cached result is copied while the output repository state and local branch list stay unchanged.This is not intended as a breaking change. It removes another unintended side effect from a read/cache operation. Code that relied on
copy_data_to_cache()creating a local output branch would behave differently, but callers can create that branch explicitly if they need it.