fix(opencode): strip prior reasoning items on Muse Spark Responses models

Strip prior-turn type: reasoning items and encrypted_content fields from body.input on Muse Spark Responses endpoints in OpenCode and OpenCode Go executors to avoid HTTP 400 errors across rotated proxy accounts.

open-sse/executors/opencode-go.js

@@ -94,6 +94,12 @@ function sanitizeResponsesItems(body) {
   if (!Array.isArray(body.input)) return;
   body.input = body.input.filter((item) => {
     if (!item || typeof item !== "object" || Array.isArray(item)) return true;
+    // Strip prior-turn reasoning items: Muse Spark contributor models route to
+    // an upstream Console backend where encrypted_content cannot be validated across
+    // rotated accounts or sessions, causing 400 "reasoning encrypted_content was not issued to this caller".
+    if (item.type === "reasoning") return false;
+    delete item.encrypted_content;
+    delete item.reasoning_encrypted_content;
     if (item.type === "function_call") {
       if (!item.name || typeof item.name !== "string" || item.name.trim() === "") return false;
       item.name = item.name.trim().slice(0, MAX_TOOL_NAME_LEN);