Merge branch 'worktree-redundant-preschool-field'
Identical tree to worktree-fix-deprecations-backend-plan (the same deprecation rename done twice under a stale branch name). Merged as a no-op; the only conflicts were the same already-deleted files as the first merge, resolved by keeping main's side. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01T4wjgbVL4HAC5Rdaw75VbV
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