Enigma: replaced tiered attribute pricing with unified credit model + new Free plan

Enigma replaced its Attribute Credit Tiers model (Core/Brand/Plus/Premium per-attribute credit pricing, $5 per 100 credits pay-as-you-go) with a single unified credit balance ($1 = 100 credits) shared across KYB, Screening, Enrichment, and Segments. Added a new free Console tier ($0, no credits needed for viewing/search/live summaries). Pro ($20/mo) now includes 2,100 credits/month ($21.00 of data at list rates), up from 600 credits/$20; Max ($200/mo) now includes 25,000 credits/month ($250.00 of data at list rates), up from 8,000 credits/$200. Enterprise moved to negotiated rates with custom allowance. New per-item rate card published (e.g. KYB Verify 250cr/$2.50, Watch list 50cr/$0.50, Address enrichment 2cr/$0.02).