feat: interrupt canceled codex app-server turns

tests/fixtures/codex-app-server-runtime.mjs

@@ -7,6 +7,7 @@ const received = [];
 let injectedItems = [];
 let extraSkillRoots = [];
 let overloadedTurnStartEmitted = false;
+let interruptibleTurn = null;
 
 function send(message) {
   process.stdout.write(`${JSON.stringify(message)}\n`);
@@ -645,6 +646,13 @@ rl.on("line", (line) => {
     if (process.env.BOSS_CODEX_APP_SERVER_FIXTURE_EXIT_AFTER_TURN_START === "1") {
       process.exit(0);
     }
+    if (process.env.BOSS_CODEX_APP_SERVER_FIXTURE_WAIT_FOR_INTERRUPT === "1") {
+      interruptibleTurn = {
+        threadId: message.params?.threadId,
+        turnId: "turn-fixture",
+      };
+      return;
+    }
     if (process.env.BOSS_CODEX_APP_SERVER_FIXTURE_EMIT_PROGRESS === "1") {
       send({
         method: "turn/plan/updated",
@@ -1503,6 +1511,25 @@ rl.on("line", (line) => {
     return;
   }
 
+  if (message.method === "turn/interrupt") {
+    send({
+      id: message.id,
+      result: {},
+    });
+    send({
+      method: "turn/completed",
+      params: {
+        threadId: message.params?.threadId ?? interruptibleTurn?.threadId,
+        turn: {
+          id: message.params?.turnId ?? interruptibleTurn?.turnId,
+          status: "interrupted",
+        },
+      },
+    });
+    process.stderr.write(`${JSON.stringify({ received })}\n`);
+    return;
+  }
+
   if (message.method === "turn/steer") {
     const text = message.params?.input?.find?.((item) => item?.type === "text")?.text ?? "";
     send({