/**
 * WorkspaceRef + backend metadata.
 *
 * See session-hierarchy.md §4.9 (WorkspaceRef) and §7 (Workspace and
 * Worktree). The `meta` field is a discriminated union on `backend` — Phase 3
 * ships the `git-worktree` variant; `tmpfs`, `container`, and `shared` land
 * in a later phase of the overall roadmap (post-MVP) without breaking
 * existing consumers (Convention #6).
 */
export {};
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