docs: add v2.0.0 migration guide

Document URL input changes and sign() restrictions.

Author: jdrhyne

README.md

@@ -34,6 +34,10 @@ or
 yarn add @nutrient-sdk/dws-client-typescript
 ```
 
+## Migration Guides
+
+- v2.0.0: See `docs/MIGRATION.md` for URL input changes and `sign()` restrictions.
+
 ## Integration with Coding Agents
 
 This package has built-in support with popular coding agents like Claude Code, GitHub Copilot, Cursor, and Windsurf by exposing scripts that will inject rules instructing the coding agents on how to use the package. This ensures that the coding agent doesn't hallucinate documentation, as well as making full use of all the features offered in Nutrient DWS TypeScript Client.

docs/MIGRATION.md

@@ -0,0 +1,32 @@
+# Migration Guide
+
+## 2.0.0
+
+### 1) URL inputs now use `FileInputWithUrl`
+
+`FileInput` no longer includes URLs. If you need to pass URLs, use `FileInputWithUrl`.
+
+```ts
+import type { FileInputWithUrl } from '@nutrient-sdk/dws-client-typescript';
+
+const input: FileInputWithUrl = 'https://example.com/doc.pdf';
+const result = await client.convert(input, 'docx');
+```
+
+### 2) `processRemoteFileInput` removed
+
+If you previously used `processRemoteFileInput`, fetch the remote file yourself and pass a buffer.
+
+```ts
+// v1.x (no longer available)
+import { processRemoteFileInput } from '@nutrient-sdk/dws-client-typescript';
+
+// v2.0.0+
+const res = await fetch('https://example.com/doc.pdf');
+const buffer = Buffer.from(await res.arrayBuffer());
+const result = await client.sign(buffer, { data: { signatureType: 'cms' } });
+```
+
+### 3) `sign()` no longer accepts URLs
+
+`sign()` only accepts local inputs (file path, Buffer, or Uint8Array). For remote files, fetch first and pass a buffer.