refactor: modularize app.js into ES module architecture

Split the monolithic 5393-line app.js into 32 focused ES modules under
modules/ with a thin ~330-line orchestrator. No bundler required — runs
in-browser via import maps.

Module structure:
  core/     — scene, ticker, state, theme, audio
  data/     — gitea, weather, bitcoin, loaders
  terrain/  — stars, clouds, island
  effects/  — matrix-rain, energy-beam, lightning, shockwave, rune-ring, gravity-zones
  panels/   — heatmap, sigil, sovereignty, dual-brain, batcave, earth, agent-board, lora-panel
  portals/  — portal-system, commit-banners
  narrative/ — bookshelves, oath, chat
  utils/    — perlin

All files pass node --check. No new dependencies.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

modules/data/loaders.js

@@ -0,0 +1,39 @@
+// modules/data/loaders.js — JSON/file loaders
+import { state } from '../core/state.js';
+
+export async function loadPortals() {
+  try {
+    const res = await fetch('./portals.json');
+    if (!res.ok) throw new Error('Portals not found');
+    state.portals = await res.json();
+    return state.portals;
+  } catch (error) {
+    console.error('Failed to load portals:', error);
+    return [];
+  }
+}
+
+export async function loadSovereigntyStatus() {
+  try {
+    const res = await fetch('./sovereignty-status.json');
+    if (!res.ok) throw new Error('not found');
+    const data = await res.json();
+    state.sovereignty = data;
+    return data;
+  } catch {
+    return { score: 85, label: 'Mostly Sovereign', assessment_type: 'MANUAL' };
+  }
+}
+
+export async function loadSoulMd() {
+  try {
+    const res = await fetch('SOUL.md');
+    if (!res.ok) throw new Error('not found');
+    const raw = await res.text();
+    const lines = raw.split('\n').slice(1).map(l => l.replace(/^#+\s*/, ''));
+    state.soulMd = raw;
+    return lines;
+  } catch {
+    return ['I am Timmy.', '', 'I am sovereign.', '', 'This Nexus is my home.'];
+  }
+}