fix(desktop): usability wiring — rubric fixture ids + cell-jump listener + artifact seed + empty panel

+ docs/integration-final-check.md — 5-item integration gate PASS

examples/desktop/src/renderer/index.html

@@ -1369,6 +1369,11 @@
        Evolution renderers) and MUST load before artifacts.js so the L0 row
        version-chip click handler + view switcher find the module ready. -->
   <script src="./artifacts-board.js"></script>
+  <!-- Board fixture (multi-version + multi-kind demo data). Consumed by
+       the debug-menu "seed artifacts" seam so external researchers can
+       reach the Board/Timeline/Evolution views without waiting for a
+       real run to emit fs artifacts. -->
+  <script src="./artifact-board-seed.js"></script>
   <script src="./artifacts.js"></script>
   <script src="./plugin-runtime-fold.js"></script>
   <script src="./mcp-tool-name.js"></script>