Reduce Git refresh subprocess fanout (#6324)

Co-authored-by: Orca <help@stably.ai>

src/main/github/stable-missing-git-remote-error.ts

@@ -0,0 +1,16 @@
+export function isStableMissingGitRemoteError(error: unknown): boolean {
+  const parts: string[] = []
+  if (error instanceof Error) {
+    parts.push(error.message)
+  }
+  if (typeof error === 'object' && error !== null && 'stderr' in error) {
+    const stderr = (error as { stderr?: unknown }).stderr
+    if (typeof stderr === 'string') {
+      parts.push(stderr)
+    }
+  }
+  if (parts.length === 0) {
+    parts.push(String(error))
+  }
+  return /no such remote/i.test(parts.join('\n'))
+}