ci: add typechecking, fail fast in CI, and patch typechecking errors (#63)

src/agent/check-approval.ts

@@ -69,10 +69,12 @@ export async function getResumeData(
         const approvalMessage = matchingMessages.find(
           (msg) => msg.message_type === "approval_request_message",
         );
-        const inContextMessage =
-          approvalMessage ?? matchingMessages[matchingMessages.length - 1]!;
+        const lastMessage = matchingMessages[matchingMessages.length - 1];
+        const inContextMessage = approvalMessage ?? lastMessage;
 
-        messageToCheck = inContextMessage;
+        if (inContextMessage) {
+          messageToCheck = inContextMessage;
+        }
       } else {
         console.warn(
           `[check-approval] In-context message ${inContextLastMessageId} not found in cursor fetch.\n` +

src/agent/model.ts

@@ -25,7 +25,13 @@ export function resolveModel(modelIdentifier: string): string | null {
  */
 export function getDefaultModel(): string {
   const defaultModel = models.find((m) => m.isDefault);
-  return defaultModel?.handle || models[0].handle;
+  if (defaultModel) return defaultModel.handle;
+
+  const firstModel = models[0];
+  if (!firstModel) {
+    throw new Error("No models available in models.json");
+  }
+  return firstModel.handle;
 }
 
 /**