Proposed signal levels
- Level 1 / monitor: unusual volume plus price lift. Good for “something is moving; check news/source quality now.”
- Level 2 / informed-flow: Level 1 plus positive Yes-side pressure and not-yet-certain price. In the current sample this fired rarely but cleanly.
- Context filter: group sibling markets, down-rank scheduled deadline/settlement arbitrage, and snapshot public news at alert time.