docs: add changeset

Author: solidsnakedev

.changeset/cold-clubs-doubt.md

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+---
+"@evolution-sdk/evolution": patch
+---
+
+Add transaction chaining support via `SignBuilder.chainResult()`
+
+- Add `chainResult()` method to `SignBuilder` for building dependent transactions
+- Returns `ChainResult` with `consumed`, `available` UTxOs and pre-computed `txHash`
+- Lazy evaluation with memoization - computed on first call, cached for subsequent calls
+- Add `signAndSubmit()` convenience method combining sign and submit in one call
+- Remove redundant `chain()`, `chainEffect()`, `chainEither()` methods from TransactionBuilder