[cli] Auto-detect fine-grained GitHub PATs by prefix

Tokens starting with 'github_pat_' are now automatically recognized as fine-grained personal access tokens, eliminating the need to use the --fg-token flag. The --fg-token flag is still supported for backwards compatibility, but users can now simply use --token or the GITHUB_TOKEN environment variable with fine-grained PATs.

This enhancement improves the user experience by reducing the need to remember which flag to use based on the token type.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: junhoyeo

src/index.ts

@@ -43,15 +43,22 @@ const main = async () => {
 
   zx.$.verbose = !!parsedOptions.verbose;
 
+  // Helper function to detect if a token is a fine-grained PAT
+  const isFineGrainedToken = (token: string): boolean => {
+    return token.startsWith('github_pat_');
+  };
+
   let githubToken: string = '';
   let isFineGrained: boolean = false;
   if (parsedOptions.token?.[0]) {
     [githubToken] = parsedOptions.token;
+    isFineGrained = isFineGrainedToken(githubToken);
   } else if (parsedOptions.fgToken?.[0]) {
     [githubToken] = parsedOptions.fgToken;
     isFineGrained = true;
   } else {
     githubToken = process.env.GITHUB_TOKEN || '';
+    isFineGrained = isFineGrainedToken(githubToken);
   }
 
   let depth: number = 1;