build(session): link V3 source-validation dependency

The structural V2-to-V3 edge reuses the frozen V0 payload and relationship helpers through their public package exports. Record the explicit workspace dependency so clean installs resolve the same validation code without editing a released migration package.

pnpm-lock.yaml

@@ -7332,6 +7332,9 @@ importers:
       '@deepseek-ai/dsh-session-format':
         specifier: workspace:^
         version: link:../session-format
+      '@deepseek-ai/dsh-session-format-v0-to-v1':
+        specifier: workspace:^
+        version: link:../session-format-v0-to-v1
       '@deepseek-ai/dsh-session-format-v1-to-v2':
         specifier: workspace:^
         version: link:../session-format-v1-to-v2