Setup guide conflates --prod flag with login subcommand

[Olalekan2345]

memory.walrus.xyz/skills/setup describes the MCP login command as "npx -y @mysten-incubation/memwal-mcp login --prod". In reality, per the actual npm package README, --prod/--staging/--local are environment-preset flags on the main memwal-mcp command (for relayer selection), not on the login subcommand. The setup guide should be corrected to show these as separate, e.g. configuring the server with --prod in args, then running login separately.

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