revert: strip Manus damage (nostr, SovOS, gutted app.js) — restore clean split

Reverts to the state of cbfacdf (split app.js into 21 modules, <1000 lines each).
Removes: nostr.js, nostr-panel.js, SovOS.js, RESEARCH_DROP_456.md, core/, data/
Historical archive preserved in .historical/ and branch archive/manus-damage-2026-03-24

Refs #418, #452, #454

modules/oath.js

@@ -53,8 +53,16 @@ scene.add(oathSpot.target);
 const AMBIENT_NORMAL = ambientLight.intensity;
 const OVERHEAD_NORMAL = overheadLight.intensity;
 
-// loadSoulMd imported from data/loaders.js and re-exported for backward compat
-export { fetchSoulMd as loadSoulMd } from './data/loaders.js';
+export async function loadSoulMd() {
+  try {
+    const res = await fetch('SOUL.md');
+    if (!res.ok) throw new Error('not found');
+    const raw = await res.text();
+    return raw.split('\n').slice(1).map(l => l.replace(/^#+\s*/, ''));
+  } catch {
+    return ['I am Timmy.', '', 'I am sovereign.', '', 'This Nexus is my home.'];
+  }
+}
 
 function scheduleOathLines(lines, textEl) {
   let idx = 0;