chore: remove debug console.log statements from production code

Three debug logs left in production paths:

- useAgent.ts: logs task string on every agent execution
- HeroSection.tsx: logs getPageInstructions url/hint on every page visit
- HeroSection.tsx: logs the full execute() result to the console

None of these are error-level events and they leak internal details
to the browser console in production builds.

packages/extension/src/agent/useAgent.ts

@@ -108,7 +108,6 @@ export function useAgent(): UseAgentResult {
 
 	const execute = useCallback(async (task: string) => {
 		const agent = agentRef.current
-		console.log('🚀 [useAgent] start executing task:', task)
 		if (!agent) throw new Error('Agent not initialized')
 
 		setCurrentTask(task)

packages/website/src/pages/home/HeroSection.tsx

@@ -77,9 +77,7 @@ export default function HeroSection() {
 				instructions: {
 					system: 'You are a helpful assistant on PageAgent website.',
 					getPageInstructions: (url: string) => {
-						const hint = url.includes('page-agent') ? 'This is PageAgent demo page.' : undefined
-						console.log('[instructions] getPageInstructions:', url, '->', hint)
-						return hint
+						return url.includes('page-agent') ? 'This is PageAgent demo page.' : undefined
 					},
 				},
 
@@ -98,8 +96,7 @@ export default function HeroSection() {
 			})
 		}
 
-		const result = await win.pageAgent.execute(task)
-		console.log(result)
+		await win.pageAgent.execute(task)
 	}
 
 	return (