orca/docs/split-groups-rollout-pr3.md

Split Groups PR 3: Worktree Restore Ownership

This branch moves worktree activation and restore logic onto the reconciled tab-group model.

Scope:

• reconcile stale unified tabs before restore
• restore active surfaces from the group model first
• fall back to terminal when a grouped worktree has no renderable surface
• create a root group before initial terminal fallback attaches a new tab

What Is Actually Hooked Up In This PR:

• opening an existing worktree restores from the reconciled group/tab model
• reopening an empty grouped worktree falls back to a terminal instead of a blank pane
• initial terminal creation is now driven by renderable grouped content instead of one-time init guards

What Is Not Hooked Up Yet:

• no split-group layout is rendered
• the visible workspace host is still the legacy terminal/browser/editor surface path
• tab-group UI components still are not mounted here

Non-goals:

• no split-group UI enablement yet