fix(kiro): preserve underscores in tool names and restore sanitized names in responses

Do not collapse consecutive underscores in uniqueName so mcp__server__tool is sent intact to Kiro, attach reverse map on request translation, and restore client tool names in responses.

open-sse/translator/concerns/kiroConversation.js

@@ -48,7 +48,6 @@ function uniqueName(rawName, index, usedNames) {
   const cleaned = String(rawName || "")
     .trim()
     .replace(TOOL_NAME_PATTERN, "_")
-    .replace(/_+/g, "_")
     .replace(/^_+|_+$/g, "");
   const base = trimCodePoints(cleaned || `tool_${index + 1}`, KIRO_TOOL_NAME_MAX_LENGTH);
   let candidate = base;

open-sse/translator/response/kiro-to-claude.js

@@ -48,9 +48,9 @@ function convertFinishReason(reason) {
  */
 // Kiro only accepts sanitized tool names; the request translator leaves the
 // reverse map on the stream state so calls come back under the client's names.
-function restoreToolName(state, name) {
+function restoreToolName(stateOrData, name) {
   const raw = name || "";
-  const map = state?.toolNameMap;
+  const map = stateOrData?.toolNameMap || stateOrData?._toolNameMap;
   return map && typeof map.get === "function" && map.has(raw) ? map.get(raw) : raw;
 }
 
@@ -254,7 +254,7 @@ export function kiroToClaudeNonStreaming(data) {
       content.push({
         type: "tool_use",
         id: tc.id || `toolu_${Date.now()}`,
-        name: restoreToolName(state, tc.function?.name),
+        name: restoreToolName(data, tc.function?.name),
         input,
       });
     }