fix(governance): replace 'End-to-end encrypted' with 'AES-256-GCM encrypted at rest'

Author: SynapseLayer

docs/introduction.mdx

@@ -1,11 +1,11 @@
 ---
 title: Introduction
-description: "Plug once. Remember forever. End-to-end encrypted."
+description: "Plug once. Remember forever. AES-256-GCM encrypted at rest."
 ---
 
 # Synapse Layer — Long-Term Memory for AI Agents
 
-> Plug once. Remember forever. End-to-end encrypted. 🧠
+> Plug once. Remember forever. AES-256-GCM encrypted at rest. 🧠
 
 ```python
 from synapse_layer import SynapseMemory