Update dbEncryptionKey setup

[humanagent]

Update agent docs to pass dbEncryptionKey directly and require a 32-byte hex DB key in create-a-client.mdx

Revise agent setup docs to use explicit wallet and DB encryption variables, remove node:crypto hex generation, convert Buffer to hex for provided keys, and update examples to pass dbEncryptionKey directly; adjust env examples to include 0x placeholders in build-an-agent.mdx.

📍Where to Start

Start with the configuration and example updates in create-a-client.mdx, focusing on the Agent.create call and dbEncryptionKey type and usage.

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Macroscope summarized 316811e.

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Project	Deployment	Preview	Comments	Updated (UTC)
docs-xmtp-org	Ready	Preview	Comment	Nov 23, 2025 0:05am

[humanagent]

hey @bennycode , added a way to explain how to load an existing encryption key. needs

import { fromString } from "uint8arrays/from-string";