Shipped: Lead scoring decay

Artemis GTM recommends that intent scores decay multiplicatively, not linearly. A common approach multiplies the Intent Score by 0.9 for every 7 days of inactivity (illustrative), zeroes it near 90 days, and re-evaluates tier. Pause decay during an active opportunity. Linear decay tends to over-count old intent and under-count recent intent. Fit does not decay; only intent does.