Add blog: Reduce Token Cost for LLMs, AI Agent Memory with Valkey and Mem0

Adds a technical deep dive covering how agent memory works, when to use local vs external memory, an implementation using Valkey and Mem0, storage-layer requirements, and production patterns. Also adds an author profile for Meet Bhagdev.

Refs #492

Signed-off-by: Chaitanya Nuthalapati <cnu@amazon.com>

Author: cnuthalapati

content/authors/mbhagdev.md

@@ -0,0 +1,8 @@
+---
+title: Meet Bhagdev
+extra:
+    photo: '/assets/media/authors/mbhagdev.jpeg'
+    github: meet-bhagdev
+---
+
+Meet is a Senior Manager, PMT-ES at AWS, leading the product management team for Amazon ElastiCache and Amazon MemoryDB. He is passionate about open source, databases, and analytics, and spends his time working with customers to understand their requirements and build delightful experiences.