feat(server): summary tools (#13133)

fix AI-281

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **New Features**
* Added a new AI-powered conversation summary tool that generates
concise summaries of key topics, decisions, and details from
conversations, with options to focus on specific areas and adjust
summary length.
* Introduced a new prompt for conversation summarization, supporting
customizable focus and summary length.

* **Bug Fixes**
* Improved tool handling and error messages for conversation
summarization when required input is missing.

* **Tests**
* Expanded test coverage to include scenarios for the new conversation
summary feature.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/__tests__/copilot-provider.spec.ts

@@ -207,6 +207,7 @@ const retry = async (
       try {
         await callback(t);
       } catch (e) {
+        console.error(`Error during ${action}:`, e);
         t.log(`Error during ${action}:`, e);
         throw e;
       }
@@ -483,6 +484,34 @@ The term **“CRDT”** was first introduced by Marc Shapiro, Nuno Preguiça, Ca
     type: 'structured' as const,
     prefer: CopilotProviderType.Gemini,
   },
+  {
+    promptName: ['Conversation Summary'],
+    messages: [
+      {
+        role: 'user' as const,
+        content: '',
+        params: {
+          messages: [
+            { role: 'user', content: 'what is single source of truth?' },
+            { role: 'assistant', content: TestAssets.SSOT },
+          ],
+          focus: 'technical decisions',
+          length: 'comprehensive',
+        },
+      },
+    ],
+    verifier: (t: ExecutionContext<Tester>, result: string) => {
+      assertNotWrappedInCodeBlock(t, result);
+      const cleared = result.toLowerCase();
+      t.assert(
+        cleared.includes('single source of truth') ||
+          /single.*source/.test(cleared) ||
+          cleared.includes('ssot'),
+        'should include original keyword'
+      );
+    },
+    type: 'text' as const,
+  },
   {
     promptName: [
       'Summary',