[Agent Wallet] Update docs

[AyushBherwani1998]

Description

Update docs for the version 6.1

Issue(s) fixed

Fixes #

Preview

Checklist

• If this PR updates or adds documentation content that changes or adds technical meaning, it has received an approval from an engineer or DevRel from the relevant team.
• If this PR updates or adds documentation content, it has received an approval from a technical writer.

External contributor checklist

• I've read the contribution guidelines.
• I've created a new issue (or assigned myself to an existing issue) describing what this PR addresses.

---

Note

Low Risk
Documentation-only changes with no runtime or application code; risk is limited to doc accuracy if it diverges from the shipped CLI.

Overview
Updates Agent Wallet documentation for v6.1 across quickstart, command reference, error codes, and troubleshooting.

Runtime requirement: Minimum Node.js is now 22.18 (was 22.x). Docs add UNSUPPORTED_NODE startup behavior, including --json error shape and upgrade steps via mm doctor.

mm tx history: --limit is capped at 1–50 (was 1–500). --after cursor pagination is documented, along with hasNextPage / endCursor in JSON/toon output and REPL next-page hints.

Policy YAML: INVALID_POLICY_YAML is documented for mm wallet policy set, with troubleshooting that points users to mm wallet policy get or mm wallet policy template as baselines.

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Project	Deployment	Actions	Updated (UTC)
metamask-docs	Ready	Preview	Aug 13, 2026 8:48am

[shahbaz17]

lgtm