fix(agents): Applied workaround for kotlin wasm bug which produced invalid wasm file (#1365)

Workaround for kotlin/wasm compiler bug 
https://youtrack.jetbrains.com/issue/KT-83728

This workaround needed so far for Kotlin/Wasm target. Backend has a bug
which makes produced wasm invalid. This is a temporary workaround in
case when koog could be released earlier than the compiler, so Air (or
other koog users) could adopt kotlin/wasm earlier.

Author: igoriakovlev

agents/agents-core/src/commonMain/kotlin/ai/koog/agents/core/agent/entity/AIAgentSubgraph.kt

@@ -258,14 +258,17 @@ public open class AIAgentSubgraph<TInput, TOutput>(
 
             // find the suitable edge to move to the next node, get the transformed output
             val resolvedEdge = currentNode.resolveEdgeUnsafe(context, nodeOutput)
-                ?: // In we are in the finish node, we need to exit, otherwise we stuck in the node
+
+            // In we are in the finish node, we need to exit, otherwise we stuck in the node
+            if (resolvedEdge == null) {
                 if (currentNode == finish) {
                     currentInput = nodeOutput
                     break
                 } else {
                     logger.error { formatLog(context, "Agent stuck in node ${currentNode.name}") }
                     throw AIAgentStuckInTheNodeException(currentNode, nodeOutput)
                 }
+            }
 
             currentNode = resolvedEdge.edge.toNode
             currentInput = resolvedEdge.output