chore: track origin EE branch in worktree setup when absent locally

[hugocasa]

Summary

Improves wm_setup_ee_worktree in scripts/worktree-common.sh so that when the current branch's matching EE branch exists on origin but isn't checked out locally in the EE repo, the worktree tracks origin/<branch> instead of silently branching off main and dropping the EE-side work already pushed to the remote.

Changes

• Add an elif arm that, when no matching local branch exists, checks for refs/remotes/origin/<branch> via git show-ref and creates the worktree on a new local branch tracking origin/<branch>.
• Differentiate the success messages across the three outcomes (existing local branch / tracking origin / new branch from main).

Test plan

• Branch exists on EE origin only (no local EE branch): setup prints "Created EE worktree ... (tracking origin/)" and git -C <worktree> rev-parse --abbrev-ref @{u} reports origin/<branch>
• Existing local EE branch: still uses it (message: "existing local branch")
• No local or remote EE branch: still falls back to a new branch from main

---

Summary by cubic

Prevents EE worktrees from branching off main when a matching branch exists only on origin. wm_setup_ee_worktree now creates a local branch that tracks origin/<branch> to keep remote EE work intact.

• Bug Fixes
  • If no local EE branch exists but origin/<branch> does, create the worktree on a new local branch tracking origin/<branch>.
  • Clarified success messages for: existing local branch, tracking origin/<branch>, and new branch from main.

^{Written for commit 8129616. Summary will update on new commits.}

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