- new validator/telemetry.py (opt-in via RALPH_WANDB=1)
- logs per-epoch: submissions/accepted/rejected/meaningful_failures,
  king val_bpb + benchmark, standing uid/stake/vtrust/vpermit, block
- single resumed run (fixed id) so restarts continue history;
  auto-step so a reset epoch counter can't break wandb
- fully best-effort: missing/unauthed/erroring wandb disables it,
  never disrupts validation
- wired init/log_epoch/finish into service.main loop
- tests for the disabled-by-default + never-raise contract

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>