feat(agentcompat): add scoped IO stream capabilities

Co-authored-by: naiba/CloudCode <hi+cloudcode@nai.ba>

service/rpc/io_stream_capability_state_default.go

@@ -0,0 +1,9 @@
+//go:build !agentcompat
+
+package rpc
+
+type agentCompatCapabilityState struct{}
+
+type agentCompatCapabilityRegistration struct{}
+
+func (*NezhaHandler) initializeAgentCompatCapabilities() {}