Phase 10: flush persisted state on session_shutdown — SPEC §11.

Append skill-reinject:state before extension teardown so the latest tracked
skills and session override survive quit, reload, and session replacement.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/index.ts

@@ -117,6 +117,10 @@ export default function skillReinject(pi: ExtensionAPI): void {
 		restoreSessionState(ctx);
 	});
 
+	pi.on("session_shutdown", async () => {
+		persistState();
+	});
+
 	pi.on("session_before_compact", async () => {
 		markAutoCompactionBeforeCompact(compactionRuntime);
 	});