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feat(WPN-1652): add Core messenger plumbing for Solana AssetsProvider - #122

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feat(WPN-1652): add Core messenger plumbing for Solana AssetsProvider#122
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Explanation

Part of migrating the Solana assets-controller staged migration from snap-solana-wallet#637 into this monorepo (PR 3 of 6, Lane A / feature-flag path only).

Follows the Tron WPN-1497 messenger plumbing pattern (#95) rather than a literal CoreAssetsAdapter class:

  • Add types/core-messenger.ts with Solana Snap messenger namespace + AssetsController / RemoteFeatureFlagController actions
  • Add endowment:messenger to snap.manifest.json
  • Construct AssetsProvider + RemoteFeatureFlagsProvider via getMessenger in snapContext
  • Inject providers into AssetsService constructor options (required for DI; not used for routing yet)
  • Add package deps: @metamask/assets-controller, @metamask/messenger, @metamask/remote-feature-flag-controller, @metamask/snap-networks-utils
  • Enable --topological-dev on root yarn build so snap-networks-utils builds before the snap

Snap-owned SnapAssetsAdapter remains the sole production read path.

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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
  • I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them
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Wire endowment:messenger, AssetsProvider, and RemoteFeatureFlagsProvider
following the Tron WPN-1497 pattern. Providers are injected into
AssetsService but Snap-owned reads remain the sole production path.

Migrated from MetaMask/snap-solana-wallet#637 (Tron-style AssetsProvider
instead of a literal CoreAssetsAdapter).

Co-authored-by: Ulisses Ferreira <ulisses@hey.com>
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