v0.3.0

• Restructured deploy into deploy/mcp-only and deploy/mcp-with-db
• Setup script asks which mode, vault name, and encryption passphrase
• MCP-only gets persistent volume (fixes auth state loss and 2-machine split)
• Single machine enforced on Fly.io (in-memory auth requires it)
• Shared IPv4 allocated by default (free instead of $2/month dedicated)
• README rewritten with decision table and three clear setup paths
• Agent instructions show deep links with visible URLs