Bump all customer-facing references to the managed base plan price from $10/month to $20/month, and scale the bundled "Includes $X of Usage Credits" copy from $10 to $20 to match the price. Covers the subscribe/billing pages, onboarding plan card and fact sheet, backlinks/AI-search access gates, and the marketing pricing/comparison/ GSC pages plus the README. Claude-Session: https://claude.ai/code/session_017QayWXGubs1JNbLbqRF4CS Co-authored-by: Claude <noreply@anthropic.com>