Craft resolveWorkspaceConfig: targets array is reference-shared, not deep-copied

Confirmed via test: when a workspace overrides targets, resolved.targets === workspace.targets (same array reference, not deep-copied) — unlike github, which IS freshly copied via object spread. Not currently a bug since no code mutates config.targets in place, but any future logic that mutates the targets array in-place (push/splice/sort) would corrupt the workspace's stored config and could leak across workspace switches. If adding target-list mutation logic in src/config.ts's resolver, copy the array first (e.g. [...targets]).