fix: read public repositories without scoped App token minting

src/core/github-token-context.ts

@@ -1,12 +1,16 @@
 import { createHash } from "crypto";
 
-interface TokenContext { quotaKey: string; renew: (force?: boolean) => Promise<string>; }
+interface TokenContext { quotaKey: string; renew: (force?: boolean) => Promise<string>; publicRepository?: string; }
 const contexts = new Map<string, TokenContext>();
 export function registerGitHubToken(token: string, context: TokenContext) {
   if (contexts.size >= 2000 && !contexts.has(token)) contexts.delete(contexts.keys().next().value!);
   contexts.set(token, context);
 }
-export function githubTokenContext(token: string) { return contexts.get(token); }
+export function githubTokenContext(token: string) {
+  const context = contexts.get(token);
+  if (!context && token.startsWith("public-read:")) throw new Error("Public repository access context expired");
+  return context;
+}
 export function githubQuotaKey(token: string) {
   return contexts.get(token)?.quotaKey || createHash("sha256").update(token).digest("hex").slice(0, 24);
 }