LSP integration steps 1-4, part of 5.

lsp/JsonRpcTransport.h

@@ -0,0 +1,29 @@
+/*
+ * JsonRpcTransport.h - placeholder transport for JSON-RPC over stdio (stub)
+ */
+#ifndef KTE_JSON_RPC_TRANSPORT_H
+#define KTE_JSON_RPC_TRANSPORT_H
+
+#include <optional>
+#include <string>
+
+namespace kte::lsp {
+struct JsonRpcMessage {
+	std::string raw; // raw JSON payload (stub)
+};
+
+class JsonRpcTransport {
+public:
+	JsonRpcTransport() = default;
+
+	~JsonRpcTransport() = default;
+
+	// Send a method call (request or notification) - stub does nothing
+	void send(const std::string &method, const std::string &payload);
+
+	// Blocking read next message (stub => returns nullopt)
+	std::optional<JsonRpcMessage> read();
+};
+} // namespace kte::lsp
+
+#endif // KTE_JSON_RPC_TRANSPORT_H