Update README.md

Author: GsCommand

README.md

@@ -333,11 +333,15 @@ Commons is designed to remain neutral and stable.
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 ## Next Layers
+
 CommandLayer follows a clean separation of concerns:
 
-- **agent-cards** → identity & discovery  
-- **protocol-commercial** → commercial verbs & endpoints  
-- **sdk-js / sdk-python** → runtime implementations & helpers
+- **protocol-commons** → free canonical Commons schemas (specs)
+- **protocol-commercial** → free canonical Commercial schemas (specs)
+- **agent-cards** → identity & discovery for agents
+- **protocol-runtime** → reference execution layer (endpoints, adapters, paywalls)
+- **sdk-js / sdk-python** → client libraries that interact with the runtime
+
 
   ----
 
@@ -355,3 +359,4 @@ CommandLayer follows a clean separation of concerns:
 
 
 
+