## Explanation

- Replace individual `AssetsContractController` messenger calls
(`getERC721OwnerOf`, `getERC1155BalanceOf`) with a new
`getNftOwnershipForMultipleNfts` utility that batches ERC-721 `ownerOf`
and ERC-1155 `balanceOf` calls through Multicall3's `aggregate3`,
falling back to individual RPC calls on unsupported chains or when
multicall fails.
- Remove `checkAndUpdateSingleNftOwnershipStatus` in favor of
`checkAndUpdateAllNftsOwnershipStatus`, which now batches all NFTs in a
single pass.
- Add an optional `standard` parameter to `isNftOwner` so callers that
already know the token standard skip redundant subcalls.
- `checkAndUpdateAllNftsOwnershipStatus` now removes NFTs confirmed as
unowned from state rather than retaining them with `isCurrentlyOwned:
false`. The "Previously Owned" NFT feature this flag powered is no
longer supported.

**Breaking Changes**
- **`checkAndUpdateSingleNftOwnershipStatus` removed** — use
`checkAndUpdateAllNftsOwnershipStatus` instead.
- **`AllowedActions` narrowed** —
`AssetsContractController:getERC721OwnerOf` and
`AssetsContractController:getERC1155BalanceOf` are no longer required by
`NftController`'s messenger. Consumers constructing the messenger must
remove these from their allowed actions list.





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## References
Ticket: https://consensyssoftware.atlassian.net/browse/ASSETS-2959
PR on Mobile: MetaMask/metamask-mobile#28655
PR on Extension: 

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## Checklist

- [ ] I've updated the test suite for new or updated code as appropriate
- [ ] I've updated documentation (JSDoc, Markdown, etc.) for new or
updated code as appropriate
- [ ] I've communicated my changes to consumers by [updating changelogs
for packages I've
changed](https://github.com/MetaMask/core/tree/main/docs/processes/updating-changelogs.md)
- [ ] I've introduced [breaking
changes](https://github.com/MetaMask/core/tree/main/docs/processes/breaking-changes.md)
in this PR and have prepared draft pull requests for clients and
consumer packages to resolve them




<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Medium Risk**
> Medium risk due to breaking API surface (`AllowedActions` narrowed,
`checkAndUpdateSingleNftOwnershipStatus` removed) and changed state
semantics (unowned NFTs are deleted), plus new multicall batching logic
that could affect ownership determination across networks.
> 
> **Overview**
> **NFT ownership checks are refactored to batch on-chain calls via
Multicall3.** `NftController.isNftOwner` and
`checkAndUpdateAllNftsOwnershipStatus` now use the new
`getNftOwnershipForMultipleNfts` helper to aggregate ERC-721 `ownerOf` /
ERC-1155 `balanceOf` calls (with fallback to individual calls when
multicall/chain support is unavailable), and callers can pass an
optional `standard` to skip unnecessary subcalls.
> 
> **Breaking behavior changes:**
`AssetsContractController:getERC721OwnerOf` and
`AssetsContractController:getERC1155BalanceOf` are removed from
`NftController` `AllowedActions`,
`checkAndUpdateSingleNftOwnershipStatus` is removed, and ownership
refresh now **removes NFTs confirmed as unowned** from state instead of
setting `isCurrentlyOwned: false`. Tests and changelog are updated
accordingly, and `multicall` gains comprehensive coverage for the new
NFT ownership batching utility.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
f782f90. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->