ci: post a reminder for updated paths

docs are the first example

Assisted-by: Oh My Pi (Claude Opus 5)

ci/github-script/run

@@ -127,4 +127,15 @@ program
     await run(checkManualFileEdits, owner, repo, pr, options)
   })
 
+program
+  .command('reminders')
+  .description('Post reminders for the paths a PR touches')
+  .argument('<owner>', 'Owner of the GitHub repository to run on (Example: NixOS)')
+  .argument('<repo>', 'Name of the GitHub repository to run on (Example: nixpkgs)')
+  .argument('<pr>', 'Number of the Pull Request to run on')
+  .action(async (owner, repo, pr, options) => {
+    const postReminders = (await import('./reminders.ts')).default
+    await run(postReminders, owner, repo, pr, options)
+  })
+
 await program.parse()