Git bundle upload now auto-falls-back to a squashed snapshot for partial/promisor clones

When creating a git bundle fails on a repository that isn't hardened and wasn't deliberately aborted, Claude Code now checks the repo's git config for signs it's a partial or promisor clone (settings like extensions.partialclone, a remote.*.partialclonefilter, or a remote.*.promisor entry). If any of these are present, it automatically retries, forcing the operation into a "squashed" mode that bundles a snapshot of the working tree instead, and marks the result as a promisor fallback.