fix: wire up extractionMode option in crawl function

The extractionMode option was documented in JSDoc but never actually
extracted from options or added to the API payload. This fix:
- Extracts extractionMode from options (defaults to true)
- Adds extraction_mode to the payload sent to the API

Now setting extractionMode: false correctly enables markdown conversion
mode instead of AI extraction mode.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: VinciGit00

src/crawl.js

@@ -37,7 +37,7 @@ export async function crawl(
   schema,
   options = {}
 ) {
-  const { mock = null, renderHeavyJs = false, stealth = false, includePaths = null, excludePaths = null, webhookUrl = null } = options;
+  const { mock = null, renderHeavyJs = false, stealth = false, includePaths = null, excludePaths = null, webhookUrl = null, extractionMode = true } = options;
 
   // Check if mock mode is enabled
   const useMock = mock !== null ? mock : isMockEnabled();
@@ -87,6 +87,7 @@ export async function crawl(
     sitemap,
     batch_size: batchSize,
     render_heavy_js: renderHeavyJs,
+    extraction_mode: extractionMode,
   };
 
   if (breadth !== null && breadth !== undefined) {