Minimal RBAC + Feature Flags + Developer Mode

- 4 roles: SuperAdmin, Operator, Reviewer, PilotUser
- Capabilities (not pages): mission.create, artifact.view, decision.approve, etc.
- Feature flags: ENABLE_REPLAY, ENABLE_MODEL_TRAINING, etc.
- Developer Mode toggle in UI (activated by permission)
- New rule: All features must link to module, capability, and role

Next: Deploy pilot environment

packages/ui/src/App.tsx

@@ -1,4 +1,5 @@
 import { Routes, Route, Link } from 'react-router-dom';
+import { useState } from 'react';
 import DatasetExplorer from './pages/DatasetExplorer';
 import ArtifactViewer from './pages/ArtifactViewer';
 import MissionUpload from './pages/MissionUpload';
@@ -8,10 +9,26 @@ import PilotChecklist from './pages/PilotChecklist';
 import ReadinessDashboard from './pages/ReadinessDashboard';
 
 function App() {
+  const [developerMode, setDeveloperMode] = useState(false);
+
   return (
     <div style={{ fontFamily: 'system-ui, sans-serif', maxWidth: 1200, margin: '0 auto', padding: 20 }}>
       <header style={{ borderBottom: '2px solid #333', paddingBottom: 20, marginBottom: 20 }}>
-        <h1>LandveX Intelligence Lab</h1>
+        <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
+          <h1>LandveX {developerMode ? '(Developer Mode)' : ''}</h1>
+          <button
+            onClick={() => setDeveloperMode(!developerMode)}
+            style={{
+              padding: '8px 16px',
+              background: developerMode ? '#ffd700' : '#f0f0f0',
+              border: '1px solid #ccc',
+              borderRadius: 4,
+              cursor: 'pointer',
+            }}
+          >
+            {developerMode ? '🔓 Developer' : '🔒 Normal'}
+          </button>
+        </div>
         <nav style={{ display: 'flex', gap: 20, marginTop: 10 }}>
           <Link to="/">Dataset Explorer</Link>
           <Link to="/upload">Mission Upload</Link>
@@ -19,6 +36,13 @@ function App() {
           <Link to="/health">Health</Link>
           <Link to="/pilot">Pilot 001</Link>
           <Link to="/readiness">Readiness</Link>
+          {developerMode && (
+            <>
+              <Link to="/datasets">Datasets</Link>
+              <Link to="/models">Models</Link>
+              <Link to="/training">Training</Link>
+            </>
+          )}
         </nav>
       </header>