Update Skill Weights

Update the skill-score tuning weights (superuser only) and SCHEDULE a full recompute so scores pick up the new weights (D-10). The recompute is coalesced with any rebuild already in flight: if one is running, this call enqueues a rerun rather than blocking on it, so a read immediately after the 200 may briefly still show the previous scores until the rerun (which reloads the new weights) completes.