feat(cortex): Epic 5 - Integration & Polish complete (MVP DONE)

Epic 5 completes the Cortex V2 MVP with end-to-end integration:

E5.S1 - Feature Flag Guards
- ActionChainCard wrapped with CORTEX_MULTI_INTENT flag
- ClarificationCard wrapped with CORTEX_V2_ENABLED flag
- NudgeToast wrapped with CORTEX_NUDGE flag
- V1 UI remains functional when flags disabled

E5.S2 - Chain Execution Flow
- handleConfirmAction routes actions to artifacts via routeIntentToArtifact()
- Nudge evaluation triggered after successful action completion
- Sequential chain execution with auto-advance useEffect
- Chain auto-completes when all actions done

E5.S3 - Integration Tests (21 tests)
- Scenario 1: Simple input → Reflex handles (4 tests)
- Scenario 2: Multi-intent → Orchestrator handles (4 tests)
- Scenario 3: Context-dependent → Pronoun resolution (4 tests)
- Scenario 4: Wondzorg → Nudge suggestion (4 tests)
- Scenario 5: Graceful fallback (3 tests)
- Scenario 6: Chain building (2 tests)

E5.S4 - Demo Script
- 5-minute demo flow with exact phrases
- 5 scenes: Reflex speed, Multi-intent, Pronoun, Nudge, Clarification
- Backup scenarios documented
- Test phrases reference included

Files changed:
- components/cortex/chat/chat-panel.tsx (feature flags + execution)
- components/cortex/command-center/command-center.tsx (NudgeToast flag)
- lib/cortex/__tests__/cortex-v2.test.ts (NEW - 21 integration tests)
- docs/intent/demo-script-cortex-v2.md (NEW - demo documentation)
- docs/intent/bouwplan-cortex-v2.md (v1.5 - MVP complete)

MVP Status: 26/26 stories, 48/48 SP - 100% COMPLETE

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

components/cortex/command-center/command-center.tsx

@@ -26,6 +26,7 @@ import { ChatPanel } from '../chat/chat-panel';
 import { ArtifactArea } from '../artifacts/artifact-area';
 import { getArtifactTitle } from '../artifacts/artifact-container';
 import { routeIntentToArtifact } from '@/lib/cortex/action-parser';
+import { isFeatureEnabled } from '@/lib/config/feature-flags';
 
 export function CommandCenter() {
   const {
@@ -131,42 +132,44 @@ export function CommandCenter() {
         </div>
       </div>
 
-      {/* Nudge Toast - E4 (fixed position, bottom-left above chat) */}
-      <AnimatePresence mode="wait">
-        {suggestions.length > 0 && (
-          <div className="fixed bottom-20 left-4 right-4 lg:left-4 lg:right-auto lg:w-[38%] z-50">
-            <NudgeToast
-              key={suggestions[0].id}
-              suggestion={suggestions[0]}
-              onAccept={(id) => {
-                const suggestion = suggestions.find((s) => s.id === id);
-                if (suggestion) {
-                  // Route the suggested intent to an artifact
-                  const artifact = routeIntentToArtifact(
-                    suggestion.suggestion.intent,
-                    suggestion.suggestion.entities,
-                    1.0 // High confidence since user explicitly accepted
-                  );
+      {/* Nudge Toast - E4 (fixed position, bottom-left above chat, feature flagged) */}
+      {isFeatureEnabled('CORTEX_NUDGE') && (
+        <AnimatePresence mode="wait">
+          {suggestions.length > 0 && (
+            <div className="fixed bottom-20 left-4 right-4 lg:left-4 lg:right-auto lg:w-[38%] z-50">
+              <NudgeToast
+                key={suggestions[0].id}
+                suggestion={suggestions[0]}
+                onAccept={(id) => {
+                  const suggestion = suggestions.find((s) => s.id === id);
+                  if (suggestion) {
+                    // Route the suggested intent to an artifact
+                    const artifact = routeIntentToArtifact(
+                      suggestion.suggestion.intent,
+                      suggestion.suggestion.entities,
+                      1.0 // High confidence since user explicitly accepted
+                    );
 
-                  if (artifact) {
-                    console.log('[CommandCenter] Opening artifact from nudge:', artifact.type);
-                    openArtifact({
-                      type: artifact.type,
-                      prefill: artifact.prefill,
-                      title: artifact.title,
-                    });
+                    if (artifact) {
+                      console.log('[CommandCenter] Opening artifact from nudge:', artifact.type);
+                      openArtifact({
+                        type: artifact.type,
+                        prefill: artifact.prefill,
+                        title: artifact.title,
+                      });
+                    }
                   }
-                }
-                acceptSuggestion(id);
-              }}
-              onDismiss={(id) => {
-                dismissSuggestion(id);
-                console.log('[CommandCenter] Nudge dismissed:', id);
-              }}
-            />
-          </div>
-        )}
-      </AnimatePresence>
+                  acceptSuggestion(id);
+                }}
+                onDismiss={(id) => {
+                  dismissSuggestion(id);
+                  console.log('[CommandCenter] Nudge dismissed:', id);
+                }}
+              />
+            </div>
+          )}
+        </AnimatePresence>
+      )}
     </div>
   );
 }