fix: simplify mermaid syntax for rendering

Author: Ismail Sajid

README.md

@@ -92,24 +92,24 @@ In 2026, **cost-efficiency is the differentiator.** agent-compose is optimized f
 
 ```mermaid
 graph TD
-    CLI["agent-compose CLI"] --> Loader["YAML Loader & Spec Validator"]
-    Loader --> DAG["DAG Constructor & Topo-Sort"]
-    DAG --> Engine["Async Execution Engine"]
+    CLI[agent-compose CLI] --> Loader[YAML Loader]
+    Loader --> DAG[DAG Constructor]
+    DAG --> Engine[Async Engine]
     
-    subgraph "Execution Layer (Parallel Dispatch)"
-        Engine --> LGraph["LangGraph Engine"]
-        Engine --> Crew["CrewAI Engine"]
-        Engine --> Direct["Direct/DeepSeek Engine"]
+    subgraph Execution_Layer
+        Engine --> LGraph[LangGraph Engine]
+        Engine --> Crew[CrewAI Engine]
+        Engine --> Direct[DeepSeek Engine]
     end
     
-    subgraph "Model Providers"
-        LGraph --> Providers["OpenAI / Anthropic / DeepSeek"]
+    subgraph Model_Providers
+        LGraph --> Providers[Cloud LLMs]
         Crew --> Providers
         Direct --> Providers
     end
     
-    Providers --> Metrics["Cost & Latency Tracking"]
-    Metrics --> Final["Final Output (MD / JSON)"]
+    Providers --> Metrics[Tracking]
+    Metrics --> Final[Final Report]
 ```
 
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