Delete the orphaned epiphany-graph viewer.html and empty elk.js (REC-111)

viewer.html has no referrer anywhere in the estate, and assets/elk.js is zero
bytes and imported by nothing. viewer.js, viewer.css and react.js stay: the
live gamecult.org Graph page mounts GameCultGraphSpaShell, whose default asset
paths are /static/epiphany-graph/assets/viewer.{css,js}, and the Pages
workflow serves these checked-in files. An earlier draft of this cut deleted
them too; Soul review caught it.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

GameCult/static/epiphany-graph/assets/elk.js

@@ -1 +0,0 @@
-

GameCult/static/epiphany-graph/viewer.html

@@ -1,14 +0,0 @@
-<!doctype html>
-<html lang="en">
-  <head>
-    <meta charset="UTF-8" />
-    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>gamecult Fractal Eusocial Web</title>
-    <script type="module" crossorigin src="./assets/viewer.js"></script>
-    <link rel="modulepreload" crossorigin href="./assets/react.js">
-    <link rel="stylesheet" crossorigin href="./assets/viewer.css">
-  </head>
-  <body>
-    <div class="gamecult-epiphany-graph-root"></div>
-  </body>
-</html>