New Feature

Each editing task gets its own worktree and branch, created from the latest origin/main unless the user specifies a different base. Read-only work can use the existing checkout. Never build on main or reuse another task's work.

Check existing isolation first

Inspect git worktree list, git status --short, the current branch, and the session's task assignment. If the environment already created a worktree for this task, keep its path and branch and skip steps 3 and 4. In step 5, use the actual assigned path. Do not infer isolation from the editor name or a branch prefix alone. Otherwise follow all steps.

Steps

1. Sync: git fetch origin.