The simulator now reads surface Elo from the canonical table
(participant_surface_elos). The existing per-window admin page still
posts to batchUpsertSurfaceElos; without this change, those edits
would silently fail to affect simulator output. Mirror every write
to both tables until Phase 4 removes the per-window path entirely.
Phase 3 Task 5 (partial — canonical write path; dedicated canonical
admin UI deferred; existing page continues to work and now
edits both tables).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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