Add note for CAIP-25 multichain API

[alexandratran]

Description

Add note to Multichain API reference to clarify that MM implements older version of CAIP-25. Wait till ChainAgnostic/CAIPs#367 is merged.

Preview

https://metamask-docs-6i0buznrl-consensys-ddffed67.vercel.app/wallet/reference/multichain-api/

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.

---

Note

Add note that MetaMask implements an older CAIP-25 and pin all CAIP-25 links to a specific revision across Multichain API docs.

• Reference (wallet/reference/multichain-api.md):
  • Convert tip to Notes and add note that MetaMask implements an older version of CAIP-25.
  • Pin CAIP-25 links to a specific revision in intro and wallet_createSession.
• Concepts/How-to:
  • Update CAIP-25 links to a specific revision in wallet/concepts/multichain-api.md and wallet/how-to/manage-networks/use-multichain.md.

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Project	Deployment	Preview	Comments	Updated (UTC)
metamask-docs	Ready	Preview	Comment	Nov 27, 2025 5:57pm

[m4sterbunny]

LGTM