feat(core-testing): RecordingJobQueue

Adds RecordingJobQueue implementing IJobQueue for use in unit tests.
Records all enqueue calls with taskSlug/input/options and returns
synthetic incrementing jobIds.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pnpm-lock.yaml

@@ -592,6 +592,9 @@ importers:
 
   packages/core-testing:
     dependencies:
+      '@repo/core-shared':
+        specifier: workspace:*
+        version: link:../core-shared
       '@tanstack/react-query':
         specifier: ^5.59.0
         version: 5.96.2(react@19.2.4)