Revert "Revert default eval agent to base-lite"

This reverts commit eed05fe.

Author: jahooma

evals/git-evals/run-eval-set.ts

@@ -72,7 +72,7 @@ class RunEvalSetCommand extends Command {
     }),
     agent: Flags.string({
       description: 'Codebuff agent id to use',
-      default: 'base-lite',
+      default: 'base',
     }),
     help: Flags.help({ char: 'h' }),
   }