Rename hosted wallet provider to embedded wallet provider

[its-applekid]

Summary

Renames all references to "hosted" wallet provider to "embedded" wallet provider throughout the SDK, aligning terminology with industry standards (Privy, Dynamic, Turnkey all use "embedded").

Closes #330

Changes

• Directory renames: wallet/*/providers/hosted/ → wallet/*/providers/embedded/
• File renames: All *Hosted* files → *Embedded*
• Type/class renames: HostedWalletProvider → EmbeddedWalletProvider, HostedProviderFactory → EmbeddedProviderFactory, etc.
• Variable renames: hostedWallet → embeddedWallet, hostedWalletConfig → embeddedWalletConfig
• Public API: embeddedWalletProvider replaces hostedWalletProvider
• Docs: Updated AGENTS.md references

Verification

• ✅ SDK builds successfully (pnpm build)
• ✅ All 52 test files pass (439 tests passed, 10 skipped)
• ✅ Lint passes (0 errors, 80 warnings — all pre-existing)
• ✅ Zero remaining "hosted" references in packages/sdk/src/

Breaking Changes

This is a breaking change to the public API surface:

• actions.wallet.hostedWalletProvider → actions.wallet.embeddedWalletProvider
• hostedWalletConfig → embeddedWalletConfig
• All Hosted* types renamed to Embedded*

[netlify]

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[jefr90]

Thanks. Closing in favor of #340.