refactor(agent): run maintenance between turns

packages/compact/command-compact/src/index.ts

@@ -27,6 +27,8 @@ function expectedFailure(error: ManualCompactionError): CommandResult {
         kind: 'error',
         text: 'Compaction is unavailable because this process has an active compaction, or the agent is not idle.',
       }
+    case 'cancelled':
+      return { kind: 'error', text: 'Compaction cancelled.' }
     case 'changed':
       return {
         kind: 'error',