release: changeset for client consistency fixes

Author: solidsnakedev

.changeset/client-consistency-fixes.md

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+---
+"@evolution-sdk/evolution": patch
+---
+
+Restructured client internals and fixed several consistency issues in the promise-based API layer.
+
+Signing logic has been extracted from `Wallets.ts` into a dedicated `internal/Signing.ts` module, and client assembly now lives in `internal/Client.ts`. The `WalletNew` module was renamed to `Wallet`; the legacy `ClientImpl` and `dual` modules were removed.
+
+`runEffectPromise` no longer mutates error stack traces — the `cleanErrorChain` infrastructure was removed entirely. `Cause.squash` now throws the original error object unchanged, which means `instanceof` checks and `_tag` discrimination work correctly when consumers catch errors from promise-based methods.
+
+All 19 `Effect.runPromise` call sites in the client layer were replaced with `runEffectPromise` so errors are consistently unwrapped across `readOnlyWallet`, `cip30Wallet`, `createOfflineSignerClient`, `createReadOnlyClient`, and `createSigningClient`.
+
+- Provider method wiring in `SigningClient` now uses spread instead of manual `.bind()` calls
+- `ProviderError.cause` is now optional, matching `WalletError` and `TransactionBuilderError`
+- Removed `cause: null` sentinels from all error constructors