feat: landing page — pain-first positioning, runtime firewall identity

[bmdhodl]

Summary

• Hero rewrite: "Your AI agent just burned $2,000 in tokens overnight. AgentGuard stops it at $5." with action bullet list (Kill, Enforce, Track, Block)
• Single product identity: Badge → "Runtime Firewall for AI Agents"
• "Who this is for": Framework badges — LangChain, LangGraph, CrewAI, AutoGen, MCP Agents
• Feature cards: Action-oriented verbs instead of noun descriptions
• NEW: Interactive demo: Animated runaway agent → loop detected → kill signal → money saved
• NEW: Competitor table: vs Langfuse, LangSmith, Helicone — highlighting unique enforcement features
• NEW: CI/CD analogy: "Docker gave you container scanning. AgentGuard gives you agent scanning."
• NEW: DIY objection handler: "Can't I just add max_iterations myself?"
• OG/Twitter meta: Updated for new positioning
• Fix: 7-90 day → 30-90 day retention

Context

Founder-level feedback: site reads like "a cool developer tool" not "a must-buy product." These changes make the pain immediate, the audience clear, and the identity singular.

Test plan

• Verify Vercel preview renders correctly
• Check interactive demo plays on scroll
• Verify competitor table is readable on mobile
• Confirm OG meta shows correctly (use ogp.me debugger)

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