Dual-mechanism evaluation system launching next week

Resi (SN46) is rolling out a dual-mechanism evaluation system starting next week with a 50/50 initial emission split between on-market and off-market competitions, gradually shifting toward off-market over time. Miners can opt into the off-market mechanism via a new `"mechanism"` field in `feature_config.json`, but off-market models must exclude on-market-only features. Both mechanisms cap at 128 UIDs; models exceeding the threshold receive zero weight. Validators will be coordinated individually for a Pylon update early next week.

• •Miners add optional `"mechanism"` field to participate in off-market appraisal.
• •Off-market models cannot include price_change, appreciation rate features.
• •Off-market models evaluated in both mechanisms; can win emissions from both.
• •Each mechanism supports max 128 UIDs; overflow models get zero weight.
• •Validators receiving individual coordination notices for Pylon update.