diff --git a/src/App.jsx b/src/App.jsx
index acb55b6..2c166bd 100644
--- a/src/App.jsx
+++ b/src/App.jsx
@@ -6,7 +6,6 @@ import Map from './screens/Map.jsx'
 import './App.css'
 
 const TOKEN_KEY = 'otivm_token'
-const SCREENS = ['ledger', 'map']
 
 export default function App() {
   const [state, setState] = useState(null)
@@ -40,6 +39,32 @@ export default function App() {
     await saveState(token, newState)
   }
 
+  // Session abandonment — forward-looking lifecycle handler.
+  // Does not delete the old save. Appends a terminal event so the record
+  // is complete. The old save becomes a historical artefact on disk.
+  // In the Simulator this event will have social and ecological consequences
+  // for the clan — a Constructor who stops participating leaves a gap.
+  // For now: mark abandoned, generate new token, bootstrap fresh in-place.
+  async function onNewGame() {
+    if (state && token) {
+      const abandoned = {
+        ...state,
+        events: [
+          ...(state.events || []),
+          { type: 'session_abandoned', route_id: null, timestamp_utc: new Date().toISOString() },
+        ],
+      }
+      await saveState(token, abandoned)
+    }
+    const newTok = generateToken()
+    localStorage.setItem(TOKEN_KEY, newTok)
+    setToken(newTok)
+    const fresh = createState(newTok)
+    setState(fresh)
+    await saveState(newTok, fresh)
+    setScreen('ledger')
+  }
+
   if (loading) {
     return (
       <div className="loading">
@@ -69,7 +94,7 @@ export default function App() {
       </nav>
       <div className="screen-wrap">
         <div style={{ display: screen === 'ledger' ? 'block' : 'none' }}>
-          <Ledger state={state} onStateChange={onStateChange} />
+          <Ledger state={state} onStateChange={onStateChange} onNewGame={onNewGame} />
         </div>
         <div style={{ display: screen === 'map' ? 'block' : 'none' }}>
           <Map state={state} />