docs: fix README accuracy

Author: mormubis

CHANGELOG.md

@@ -5,6 +5,14 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com), and this
 project adheres to [Semantic Versioning](https://semver.org).
 
+## [2.0.1] - 2026-04-09
+
+### Fixed
+
+- Documented `PromotionPieceType` type export and corrected `Move` type
+  documentation — `Move` is defined locally (not re-exported from
+  `@echecs/position`) and has a `promotion?: PromotionPieceType` field.
+
 ## [2.0.0] - 2026-04-09
 
 ### Changed

README.md

@@ -69,10 +69,20 @@ interface SanMove {
 `file` and `rank` are the disambiguation hints from the SAN string, not the
 destination square. `to` is `undefined` for castling moves.
 
-`Move` and `Position` are re-exported from `@echecs/position`:
+`Move` is defined locally in `@echecs/san`:
 
 ```typescript
-import type { Move, Position } from '@echecs/san';
+interface Move {
+  from: Square;
+  promotion?: PromotionPieceType;
+  to: Square;
+}
+```
+
+`Position` is re-exported from `@echecs/position` for convenience:
+
+```typescript
+import type { Move, Position, PromotionPieceType } from '@echecs/san';
 ```
 
 ## Errors

package.json

@@ -74,5 +74,5 @@
   },
   "type": "module",
   "types": "dist/index.d.ts",
-  "version": "2.0.0"
+  "version": "2.0.1"
 }