Runs git push -u origin <branch> in the worktree. Detects no-changes
(HEAD = origin/main) before pushing. Classifies push failures into
no-credentials, conflict, or unknown via stderr pattern matching.
5 unit tests covering all paths.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Removes worktree dir via `git worktree remove --force` and deletes
the local branch by default; keepBranch=true preserves the branch.
Returns { removed: false } when the worktree path doesn't exist.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>