Add architecture diagram to documentation for system overview

Add a new image asset for the Tx OS architecture diagram to the agent assets metadata.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 77cfe984-2c65-4152-bb7a-0df28274fe66
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: bb62dba0-f271-4e9f-8557-8aea537e7d67
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/c3c252e4-c83d-40ca-9fff-99a3ea60701e/77cfe984-2c65-4152-bb7a-0df28274fe66/m92e9kU
Replit-Helium-Checkpoint-Created: true

.agents/agent_assets_metadata.toml

@@ -54,6 +54,12 @@ uri = "file://artifacts/tx-os/public/service-images/saudi-coffee.png"
 type = "image"
 title = "saudi coffee dark brown"
 
+[[generated]]
+id = "5P3RlYHsmEdwFZ7rKuMx5"
+uri = "file://attached_assets/generated_images/tx_os_architecture.png"
+type = "image"
+title = "tx os architecture diagram"
+
 [[outputs]]
 id = "LYgvZ2mSFO2a8Q7YzWuYh"
 uri = "file://attached_assets/tx-icon/main.svg"
@@ -95,3 +101,9 @@ id = "q0qIXlE_5tmKQXANX-jj-"
 uri = "file://attached_assets/pdf-checks/arabic-pdf-render.png"
 type = "image"
 title = "PDF تجربة - عرض النص العربي"
+
+[[outputs]]
+id = "Q2zfR7rictkhIQnecDPll"
+uri = "file://attached_assets/generated_images/tx_os_architecture.png"
+type = "image"
+title = "بنية نظام Tx OS — من البنية التحتية إلى المستخدم"