Module workspace 

Git workspace helpers for parallel task isolation (clone-based).

Responsibilities:

• Create and remove isolated git workspaces for parallel task execution.
• Compute the workspace root path using resolved configuration.
• Ensure clones are pushable by resolving the real origin remote.

Not handled here:

• Task selection or worker orchestration (see commands::run::parallel).
• PR creation or merge operations (see git::pr).
• Integration conflict resolution policy (see commands::run::parallel::integration).

Invariants/assumptions:

• git is available and the repo root is valid.
• Workspace paths are unique per task ID.
• Clones must have a pushable origin remote.