sync: tsp-arb-latency harness fix (#1212) to main - #1214
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#1212) Bench 080 published only 7 samples across 3 of 11 assets in 24h at 50 bps trigger. Two contributing causes fixed together: 1) Trigger from 50 -> 25 bps. 50 bps in 90s is a headline move on Nasdaq (earnings, macro prints), not a steady-state event. 25 bps is above normal intra-minute noise on liquid stocks and captures real arb-worthy moves without collapsing the semantic. 2) Sub-poll convergence credited. When the reference moves past the trigger AND the pool is already within band on the same tick, the arb closed inside one poll interval. Previously dropped silently; now observed at pollInterval (60s) so the fast-arb tail on liquid pools stops disappearing from the histogram. Convergence threshold stays at 20 bps: the "how close is the pool to fair" question is unchanged, only trigger sensitivity moves. Spec text (subtitle, methodology, FAQ) updated to 25 bps throughout. Co-authored-by: Florent Tapponnier <contact@mobula.io>
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Cherry-pick of #1212 harness changes only (spec is dev-only). Lower trigger 50->25 bps + credit sub-poll closures. Railway auto-rebuilds tokenized-stock-peg after merge.