feat(cli): force runParallel for agentic checks

Agentic checks always run in parallel for better reporting UX.
The construct omits runParallel from props (users can't override it)
and hardcodes it to true in synthesize().

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: thebiglabasky

packages/cli/src/constructs/__tests__/agentic-check.spec.ts

@@ -66,6 +66,7 @@ describe('AgenticCheck', () => {
               activated: true,
               frequency: 30,
               locations: ['us-east-1', 'eu-west-1'],
+              runParallel: true,
             }),
           }),
         ]),

packages/cli/src/constructs/agentic-check.ts

@@ -4,7 +4,7 @@ import { CheckTypes } from '../constants'
 import { Diagnostics } from './diagnostics'
 import { InvalidPropertyValueDiagnostic } from './construct-diagnostics'
 
-export interface AgenticCheckProps extends CheckProps {
+export interface AgenticCheckProps extends Omit<CheckProps, 'runParallel'> {
   /**
    * The prompt that defines what the agentic check should verify.
    * Maximum 10,000 characters.
@@ -83,6 +83,7 @@ export class AgenticCheck extends Check {
       ...super.synthesize(),
       checkType: CheckTypes.AGENTIC,
       prompt: this.prompt,
+      runParallel: true,
     }
   }
 }