merge: lane/sampled-spec-quality-20260819 @ 9e3fc3d154 — three pre-existing sampled-path defects: SIX boundary sites emitted argmax inside sampled streams (measured 1.71% of a customer's tokens drawn from the wrong distribution at c=1, 1 in 58, concentrated in the low-concurrency interactive tier), penalty history was truncated to the burst instead of spanning the session, and restored sessions never republished an extended entry. Penalized-restore refusal lifted as a consequence.