refactor(web): move the produced-files row into its own plugin package

ui-conversation now owns only the conversation.chat.turnTail hole; the row,
its derivation, and its copy live in @deepseek-ai/dsh-client-ui-deliverables,
composed in or out by one cordis.yml line.

pnpm-lock.yaml

@@ -179,6 +179,9 @@ importers:
       '@deepseek-ai/dsh-client-ui-conversation':
         specifier: workspace:^
         version: link:../../packages/client/ui-conversation
+      '@deepseek-ai/dsh-client-ui-deliverables':
+        specifier: workspace:^
+        version: link:../../packages/client/ui-deliverables
       '@deepseek-ai/dsh-client-ui-goal':
         specifier: workspace:^
         version: link:../../packages/client/ui-goal
@@ -1440,6 +1443,37 @@ importers:
         specifier: ^18.2.0
         version: 18.3.1
 
+  packages/client/ui-deliverables:
+    dependencies:
+      react:
+        specifier: ^18.2.0
+        version: 18.3.1
+    devDependencies:
+      '@deepseek-ai/dsh-client-locale':
+        specifier: workspace:^
+        version: link:../locale
+      '@deepseek-ai/dsh-client-runtime':
+        specifier: workspace:^
+        version: link:../runtime
+      '@deepseek-ai/dsh-client-test-runtime':
+        specifier: workspace:^
+        version: link:../test-runtime
+      '@deepseek-ai/dsh-client-ui-conversation':
+        specifier: workspace:^
+        version: link:../ui-conversation
+      '@deepseek-ai/dsh-client-ui-slots':
+        specifier: workspace:^
+        version: link:../ui-slots
+      '@deepseek-ai/dsh-invariants':
+        specifier: workspace:^
+        version: link:../../support/invariants
+      '@types/react':
+        specifier: ~18.3.1
+        version: 18.3.31
+      cordis:
+        specifier: ^4.0.0-rc.7
+        version: link:../../../vendor/cordis
+
   packages/client/ui-goal:
     devDependencies:
       '@deepseek-ai/dsh-client-connection':