docs: cookbook for multi-tenant server apps (one MemWalAccount, namespace per end-user wallet)

[Olympusxvn]

Context

Building Mr. Toxic Special One for Walrus Sessions 4 (World Cup 2026 roast chatbot). Pattern we had to infer:

• Operator creates one MemWalAccount + delegate key on memory.walrus.xyz/dashboard
• Server (Next.js API routes on Vercel) holds MEMWAL_PRIVATE_KEY + MEMWAL_ACCOUNT_ID
• End users only connect a Sui wallet for auth — no MemWalAccount per user
• Isolation via per-wallet namespace, e.g. special-one-{walletAddress.toLowerCase()}

This is a common SaaS / hackathon pattern but not spelled out in SDK quickstart (which focuses on single-user or chatbot middleware).

What would help

A short cookbook page covering:

1. Delegate key setup (not owner key) + revoke flow
2. Recommended namespace naming for multi-user apps
3. Next.js / serverless example: load profile → mutate → remember/rememberAndWait in API route
4. Security notes: never expose delegate key to browser; wallet signature for identity only
5. Link to MemWalAccount explorer for submission/demos

Our implementation (reference)

• Client: lib/memory/client.ts — single MemWal.create() with delegate creds
• Namespaces: special-one-{address} per request
• Setup doc we wrote ourselves: https://github.com/Olympusxvn/special-one-agent/blob/master/docs/MEMWAL_SETUP.md

Environment

• @mysten-incubation/memwal@0.0.7
• Relayer: https://relayer.memory.walrus.xyz (mainnet)
• Deploy: Vercel serverless

Walrus Sessions 4 feedback — happy to PR a docs snippet if useful.