Landing page redesign with WebGL hero, features grid, FAQ, and CTA sections

Features

• Landing page redesign with WebGL hero, features grid, FAQ, and CTA sections
• Email lists foundation with migration, types, and CRUD API
• CLI lists command group for managing email lists
• CLI post-signup onboarding with autonomy level selection
• CLI shorthand send flags: --subject, --body, --html
• List analytics endpoints for stats, growth, and send performance
• Portal autonomy level controls replacing HITL toggle
• Docs: reactive agent guide for building event-driven agents with molted listen
• SEO: agent-native-email hub links added to blog posts

Fixes

• Fixed template createVersion 500 error from NOT NULL violation on variables
• Fixed hero spinner showing on cached background images
• Fixed landing page copy and thinner how-it-works stripes
• Extracted FAQ data to server-safe module to fix landing build
• Added missing pricing-preview landing component
• Routed all CLI traffic through agentic-mailbox with smoketest fixes