[doc] Partition Memories by Entity , features doc and cookbook (#3735)

docs/cookbooks/frameworks/eliza-os-character.mdx

@@ -76,8 +76,8 @@ This is a simple example of how to use Mem0 to create a personalized AI agent. Y
 ---
 
 <CardGroup cols={2}>
-  <Card title="Build AI with Personality" icon="sparkles" href="/cookbooks/essentials/building-ai-with-personality">
-    Separate agent and user memories to maintain consistent character personalities.
+  <Card title="Partition Memories by Entity" icon="layers" href="/cookbooks/essentials/entity-partitioning-playbook">
+    Keep character personas isolated by tagging user, agent, and session identifiers.
   </Card>
   <Card title="AI Tutor with Mem0" icon="graduation-cap" href="/cookbooks/companions/ai-tutor">
     Build another type of personalized companion with memory capabilities.

docs/cookbooks/frameworks/llamaindex-multiagent.mdx

@@ -365,7 +365,7 @@ Based on our previous session, I remember we covered Vision Language Models and
   <Card title="LlamaIndex ReAct with Mem0" icon="brain" href="/cookbooks/frameworks/llamaindex-react">
     Start with single-agent patterns before scaling to multi-agent systems.
   </Card>
-  <Card title="Build AI with Personality" icon="sparkles" href="/cookbooks/essentials/building-ai-with-personality">
-    Learn how to scope memories across multiple agents and users.
+  <Card title="Partition Memories by Entity" icon="layers" href="/cookbooks/essentials/entity-partitioning-playbook">
+    Learn how to scope memories across multiple agents, users, and sessions.
   </Card>
 </CardGroup>