rebase

Rebase the current branch.

Arguments: $ARGUMENTS

Behavior:

• No arguments: rebase on the current branch's workmux base branch (git config branch.<current>.workmux-base), falling back to local main when none is configured
• "origin": fetch origin, rebase on origin/main
• "origin/branch": fetch origin, rebase on origin/branch
• "branch": rebase on local branch (use "main" to force a rebase on local main)

Steps: