feat: Enable /setup-github to always run, and error appropriately (#5653)

Co-authored-by: Jacob Richman <jacob314@gmail.com>

packages/cli/src/services/BuiltinCommandLoader.ts

@@ -32,7 +32,6 @@ import { themeCommand } from '../ui/commands/themeCommand.js';
 import { toolsCommand } from '../ui/commands/toolsCommand.js';
 import { vimCommand } from '../ui/commands/vimCommand.js';
 import { setupGithubCommand } from '../ui/commands/setupGithubCommand.js';
-import { isGitHubRepository } from '../utils/gitUtils.js';
 
 /**
  * Loads the core, hard-coded slash commands that are an integral part
@@ -74,7 +73,7 @@ export class BuiltinCommandLoader implements ICommandLoader {
       themeCommand,
       toolsCommand,
       vimCommand,
-      ...(isGitHubRepository() ? [setupGithubCommand] : []),
+      setupGithubCommand,
     ];
 
     return allDefinitions.filter((cmd): cmd is SlashCommand => cmd !== null);