feat(wallet): add unified cross-chain wallet adapters - #186
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Summary
Adds a unified cross-chain wallet adapter API for Stellar, EVM, and Solana wallets.
Changes
Added the WalletAdapter discriminated union with:
Added deriveStealthKeysFromWallet(adapter) to route signatures through the correct chain-specific derivation.
Added dependency-free reference adapters for:
Exported the new API from the SDK root entry point.
Updated WebAuthnPasskeyStealthSigner to implement the Stellar wallet adapter interface.
Extended examples/multichain-scan to derive Stellar and EVM keys from one adapter registry and scan their test deployments.
Added focused routing and adapter tests.
The reference adapters use structural interfaces and do not hard-import optional wallet packages.
Validation
pnpm build
pnpm test
Multichain example type-check passes.
git diff --check passes.
closes #181