← back to 4square Agentabrams
scaffold 4square design board
57645dbae8360c4b4d76afcde59c878dcc06acd5 · 2026-05-14 09:01:14 -0700 · Steve
- 2x2 drop slots with HTML5 drag-and-drop from a TSD-catalog rail
- Selections persist in localStorage (key: 4square.agentabrams.layout.v1)
- Slot↔slot swap + clear-per-slot + reset-all
- Basic auth gate (admin / DWShowroom2026) via timing-safe compare
- TSD catalog proxied through /api/catalog/* + /img (no CORS, same-origin)
- Runs on PORT 9702 (9900 collided with wallpaperdictionary)
Verified locally: 60 catalog tiles load, 3 drops persist across reload,
slot↔slot swap persists across reload, zero console errors.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Files touched
A .deploy.confA .gitignoreA ecosystem.config.jsA package-lock.jsonA package.jsonA public/index.htmlA server.js
Diff
commit 57645dbae8360c4b4d76afcde59c878dcc06acd5
Author: Steve <steve@designerwallcoverings.com>
Date: Thu May 14 09:01:14 2026 -0700
scaffold 4square design board
- 2x2 drop slots with HTML5 drag-and-drop from a TSD-catalog rail
- Selections persist in localStorage (key: 4square.agentabrams.layout.v1)
- Slot↔slot swap + clear-per-slot + reset-all
- Basic auth gate (admin / DWShowroom2026) via timing-safe compare
- TSD catalog proxied through /api/catalog/* + /img (no CORS, same-origin)
- Runs on PORT 9702 (9900 collided with wallpaperdictionary)
Verified locally: 60 catalog tiles load, 3 drops persist across reload,
slot↔slot swap persists across reload, zero console errors.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
.deploy.conf | 7 +
.gitignore | 9 +
ecosystem.config.js | 17 ++
package-lock.json | 827 ++++++++++++++++++++++++++++++++++++++++++++++++++++
package.json | 12 +
public/index.html | 348 ++++++++++++++++++++++
server.js | 102 +++++++
7 files changed, 1322 insertions(+)
diff --git a/.deploy.conf b/.deploy.conf
new file mode 100644
index 0000000..dab3994
--- /dev/null
+++ b/.deploy.conf
@@ -0,0 +1,7 @@
+PROJECT_NAME=4square-agentabrams
+DEPLOY_PATH=/root/public-projects/4square-agentabrams
+HEALTH_URL=http://localhost:9702/health
+INSTALL_CMD="npm ci --omit=dev"
+BUILD_CMD=""
+REQUIRED_ENVS=""
+RSYNC_EXTRA_EXCLUDES="tmp"
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..711f94e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,9 @@
+node_modules/
+.env
+.env.*
+*.log
+.DS_Store
+dist/
+build/
+.next/
+tmp/
diff --git a/ecosystem.config.js b/ecosystem.config.js
new file mode 100644
index 0000000..baeacd4
--- /dev/null
+++ b/ecosystem.config.js
@@ -0,0 +1,17 @@
+module.exports = {
+ apps: [{
+ name: '4square-agentabrams',
+ script: 'server.js',
+ cwd: __dirname,
+ env: {
+ NODE_ENV: 'production',
+ PORT: 9702,
+ BASIC_AUTH_USER: 'admin',
+ BASIC_AUTH_PASS: 'DWShowroom2026',
+ CATALOG_UPSTREAM: 'https://thesetdecorator.com',
+ },
+ max_memory_restart: '256M',
+ autorestart: true,
+ watch: false,
+ }],
+};
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..adc50f5
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,827 @@
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diff --git a/package.json b/package.json
new file mode 100644
index 0000000..28f2bd7
--- /dev/null
+++ b/package.json
@@ -0,0 +1,12 @@
+{
+ "name": "4square-agentabrams",
+ "version": "0.1.0",
+ "private": true,
+ "main": "server.js",
+ "scripts": {
+ "start": "node server.js"
+ },
+ "dependencies": {
+ "express": "^4.19.2"
+ }
+}
diff --git a/public/index.html b/public/index.html
new file mode 100644
index 0000000..480b5c0
--- /dev/null
+++ b/public/index.html
@@ -0,0 +1,348 @@
+<!doctype html>
+<html lang="en">
+<head>
+ <meta charset="utf-8">
+ <meta name="viewport" content="width=device-width,initial-scale=1,viewport-fit=cover">
+ <title>4Square — Agent Abrams</title>
+ <link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;700&family=Inter:wght@400;500;600&display=swap">
+ <style>
+ :root {
+ --bg: #0e0d0b;
+ --card: #19181640;
+ --rule: #2a2825;
+ --fg: #f3ecdd;
+ --muted: #9d9586;
+ --accent: #d9b14e;
+ --font-display: 'Playfair Display', serif;
+ --font-ui: 'Inter', system-ui, sans-serif;
+ --rad: 14px;
+ --slot-gap: 18px;
+ }
+ * { box-sizing: border-box; }
+ html, body { margin: 0; background: var(--bg); color: var(--fg); font-family: var(--font-ui); }
+ body { min-height: 100vh; }
+ header.top {
+ display: flex; align-items: center; justify-content: space-between;
+ padding: 14px 22px; border-bottom: 1px solid var(--rule);
+ background: linear-gradient(180deg, #1c1a17 0%, #14130f 100%);
+ }
+ header.top h1 {
+ font-family: var(--font-display); margin: 0;
+ font-size: 1.45rem; letter-spacing: 0.01em;
+ color: var(--accent);
+ }
+ header.top .sub { color: var(--muted); font-size: 0.82rem; letter-spacing: 0.06em; text-transform: uppercase; }
+ header .save-status { color: var(--muted); font-size: 0.75rem; }
+ header .save-status.flash { color: var(--accent); }
+
+ .app { display: grid; grid-template-columns: 320px 1fr; gap: 18px; padding: 18px; min-height: calc(100vh - 60px); }
+
+ /* Rail — draggable tile catalog */
+ aside.rail {
+ background: var(--card); border: 1px solid var(--rule); border-radius: var(--rad);
+ padding: 14px; display: flex; flex-direction: column; gap: 10px; min-height: 0;
+ }
+ aside.rail h2 { font-family: var(--font-display); margin: 0 0 4px; font-size: 1.05rem; }
+ aside.rail .controls { display: flex; flex-direction: column; gap: 6px; }
+ aside.rail input, aside.rail select {
+ background: #100f0d; color: var(--fg); border: 1px solid var(--rule); border-radius: 8px;
+ padding: 7px 10px; font: 0.85rem var(--font-ui);
+ }
+ aside.rail .meta { color: var(--muted); font-size: 0.72rem; }
+ .tile-list { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; overflow-y: auto; padding-right: 4px; flex: 1 1 auto; }
+ .tile {
+ aspect-ratio: 1/1.15; background: #100f0d; border: 1px solid var(--rule); border-radius: 10px;
+ overflow: hidden; cursor: grab; position: relative; user-select: none;
+ transition: border-color 0.15s ease, transform 0.15s ease;
+ }
+ .tile:active { cursor: grabbing; }
+ .tile.dragging { opacity: 0.4; }
+ .tile img { width: 100%; height: 100%; object-fit: cover; display: block; }
+ .tile .tile-label {
+ position: absolute; left: 0; right: 0; bottom: 0; padding: 5px 7px;
+ font: 600 0.65rem var(--font-ui); color: #fff; line-height: 1.1;
+ background: linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.78) 100%);
+ letter-spacing: 0.02em; text-transform: uppercase;
+ }
+
+ /* 2×2 board */
+ main.board { display: grid; grid-template-columns: 1fr 1fr; grid-template-rows: 1fr 1fr; gap: var(--slot-gap); min-height: 0; }
+ .slot {
+ position: relative; background: #131210; border: 2px dashed var(--rule); border-radius: var(--rad);
+ overflow: hidden; min-height: 240px; transition: border-color 0.15s ease, background 0.15s ease;
+ }
+ .slot.empty::after {
+ content: attr(data-empty-label); position: absolute; inset: 0;
+ display: flex; align-items: center; justify-content: center;
+ color: var(--muted); font: 600 0.85rem var(--font-ui); letter-spacing: 0.16em; text-transform: uppercase;
+ pointer-events: none;
+ }
+ .slot.over { border-color: var(--accent); background: #1a1714; }
+ .slot.filled { border-style: solid; border-color: var(--rule); cursor: grab; }
+ .slot.filled:active { cursor: grabbing; }
+ .slot.dragging-source { opacity: 0.5; }
+ .slot img { width: 100%; height: 100%; object-fit: cover; display: block; }
+ .slot .badge {
+ position: absolute; top: 8px; left: 8px;
+ background: rgba(20, 18, 15, 0.85); color: var(--accent);
+ font: 700 0.65rem var(--font-ui); letter-spacing: 0.1em;
+ padding: 3px 8px; border-radius: 999px; backdrop-filter: blur(6px);
+ }
+ .slot .info {
+ position: absolute; left: 0; right: 0; bottom: 0; padding: 10px 14px;
+ background: linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.85) 100%);
+ font-family: var(--font-display); color: #fff; font-size: 0.95rem;
+ }
+ .slot .info .by { font: 0.72rem var(--font-ui); color: var(--muted); margin-top: 2px; }
+ .slot .clear {
+ position: absolute; top: 8px; right: 8px;
+ background: rgba(20, 18, 15, 0.85); color: var(--fg); border: 1px solid var(--rule);
+ width: 26px; height: 26px; border-radius: 999px; cursor: pointer;
+ display: none; align-items: center; justify-content: center; font-size: 1rem; line-height: 1;
+ }
+ .slot.filled .clear { display: flex; }
+ .slot .clear:hover { background: #d44; color: #fff; }
+
+ @media (max-width: 880px) {
+ .app { grid-template-columns: 1fr; padding: 12px; gap: 14px; }
+ main.board { grid-template-columns: 1fr 1fr; }
+ aside.rail { max-height: 50vh; }
+ }
+
+ button.action {
+ background: transparent; color: var(--fg); border: 1px solid var(--rule);
+ padding: 7px 14px; border-radius: 8px; cursor: pointer; font: 600 0.78rem var(--font-ui);
+ letter-spacing: 0.05em;
+ }
+ button.action:hover { border-color: var(--accent); color: var(--accent); }
+ </style>
+</head>
+<body>
+ <header class="top">
+ <div>
+ <h1>4Square</h1>
+ <div class="sub">Agent Abrams · drag a piece into a square</div>
+ </div>
+ <div style="display:flex;align-items:center;gap:14px">
+ <span class="save-status" id="save-status">layout autosaves to this browser</span>
+ <button class="action" id="reset-all" title="Clear all four squares">Reset all</button>
+ </div>
+ </header>
+
+ <div class="app">
+ <aside class="rail">
+ <h2>Catalog</h2>
+ <div class="controls">
+ <input id="q" type="search" placeholder="Search title, artist, era…" autocomplete="off">
+ <select id="artist"><option value="">All artists</option></select>
+ </div>
+ <div class="meta" id="rail-meta">loading…</div>
+ <div class="tile-list" id="tiles"></div>
+ </aside>
+
+ <main class="board" id="board">
+ <div class="slot empty" data-slot="1" data-empty-label="1"></div>
+ <div class="slot empty" data-slot="2" data-empty-label="2"></div>
+ <div class="slot empty" data-slot="3" data-empty-label="3"></div>
+ <div class="slot empty" data-slot="4" data-empty-label="4"></div>
+ </main>
+ </div>
+
+ <script>
+ const STORAGE_KEY = '4square.agentabrams.layout.v1';
+
+ // ── persisted state ──────────────────────────────────────────────
+ let layout = loadLayout();
+
+ function loadLayout() {
+ try {
+ const raw = localStorage.getItem(STORAGE_KEY);
+ if (!raw) return { 1: null, 2: null, 3: null, 4: null };
+ const parsed = JSON.parse(raw);
+ return { 1: parsed[1] || null, 2: parsed[2] || null, 3: parsed[3] || null, 4: parsed[4] || null };
+ } catch { return { 1: null, 2: null, 3: null, 4: null }; }
+ }
+ function saveLayout() {
+ try {
+ localStorage.setItem(STORAGE_KEY, JSON.stringify(layout));
+ flashSaved();
+ } catch (e) {
+ document.getElementById('save-status').textContent = 'autosave failed: ' + e.message;
+ }
+ }
+ function flashSaved() {
+ const el = document.getElementById('save-status');
+ el.textContent = 'saved ✓';
+ el.classList.add('flash');
+ clearTimeout(flashSaved._t);
+ flashSaved._t = setTimeout(() => {
+ el.classList.remove('flash');
+ el.textContent = 'layout autosaves to this browser';
+ }, 1200);
+ }
+
+ // ── render slots ─────────────────────────────────────────────────
+ const board = document.getElementById('board');
+ function renderSlots() {
+ board.querySelectorAll('.slot').forEach(slot => {
+ const n = slot.dataset.slot;
+ const item = layout[n];
+ slot.innerHTML = '';
+ slot.classList.toggle('filled', !!item);
+ slot.classList.toggle('empty', !item);
+ slot.setAttribute('draggable', item ? 'true' : 'false');
+ if (item) {
+ const img = document.createElement('img');
+ img.src = item.imageProxy;
+ img.alt = item.title || '';
+ img.loading = 'lazy';
+ const badge = document.createElement('span');
+ badge.className = 'badge';
+ badge.textContent = '#' + n;
+ const info = document.createElement('div');
+ info.className = 'info';
+ info.innerHTML = '<div>' + escapeHtml(item.title || 'Untitled') + '</div>' +
+ '<div class="by">' + escapeHtml(item.artist || '') + (item.year ? ' · ' + item.year : '') + '</div>';
+ const clear = document.createElement('button');
+ clear.className = 'clear'; clear.title = 'Clear this square'; clear.textContent = '×';
+ clear.addEventListener('click', (e) => {
+ e.stopPropagation();
+ layout[n] = null; saveLayout(); renderSlots();
+ });
+ slot.append(img, badge, info, clear);
+ }
+ });
+ }
+
+ function escapeHtml(s) {
+ return String(s).replace(/[&<>"']/g, c => ({ '&':'&','<':'<','>':'>','"':'"',"'":''' }[c]));
+ }
+
+ // ── drag/drop wiring ─────────────────────────────────────────────
+ // Tile -> slot OR slot -> slot. Data payload format: { kind: 'tile'|'slot', payload }
+ function attachSlotDnD() {
+ board.querySelectorAll('.slot').forEach(slot => {
+ slot.addEventListener('dragstart', (e) => {
+ const n = slot.dataset.slot;
+ if (!layout[n]) { e.preventDefault(); return; }
+ e.dataTransfer.effectAllowed = 'move';
+ e.dataTransfer.setData('application/x-4sq', JSON.stringify({ kind: 'slot', from: n }));
+ slot.classList.add('dragging-source');
+ });
+ slot.addEventListener('dragend', () => slot.classList.remove('dragging-source'));
+ slot.addEventListener('dragover', (e) => {
+ e.preventDefault();
+ e.dataTransfer.dropEffect = 'move';
+ slot.classList.add('over');
+ });
+ slot.addEventListener('dragleave', () => slot.classList.remove('over'));
+ slot.addEventListener('drop', (e) => {
+ e.preventDefault();
+ slot.classList.remove('over');
+ const raw = e.dataTransfer.getData('application/x-4sq');
+ if (!raw) return;
+ let payload;
+ try { payload = JSON.parse(raw); } catch { return; }
+ const target = slot.dataset.slot;
+ if (payload.kind === 'tile') {
+ layout[target] = payload.item;
+ } else if (payload.kind === 'slot') {
+ const from = payload.from;
+ if (from === target) return;
+ const tmp = layout[target];
+ layout[target] = layout[from];
+ layout[from] = tmp; // swap (tmp may be null = move)
+ }
+ saveLayout();
+ renderSlots();
+ });
+ });
+ }
+ attachSlotDnD();
+ renderSlots();
+
+ // ── catalog rail ─────────────────────────────────────────────────
+ const $q = document.getElementById('q');
+ const $artist = document.getElementById('artist');
+ const $tiles = document.getElementById('tiles');
+ const $meta = document.getElementById('rail-meta');
+
+ let railItems = [];
+ let lastQueryToken = 0;
+ async function fetchRail() {
+ const token = ++lastQueryToken;
+ $meta.textContent = 'loading…';
+ const params = new URLSearchParams();
+ if ($q.value) params.set('q', $q.value);
+ if ($artist.value) params.set('artist', $artist.value);
+ params.set('limit', '60');
+ try {
+ const r = await fetch('/api/catalog/search?' + params.toString());
+ const j = await r.json();
+ if (token !== lastQueryToken) return; // a newer query already fired
+ railItems = j.items || [];
+ $meta.textContent = `${railItems.length} of ${(j.total || railItems.length).toLocaleString()} pieces`;
+ renderRail();
+ } catch (e) {
+ $meta.textContent = 'load failed: ' + e.message;
+ }
+ }
+ function renderRail() {
+ $tiles.innerHTML = '';
+ for (const it of railItems) {
+ const div = document.createElement('div');
+ div.className = 'tile';
+ div.draggable = true;
+ const imageProxy = '/img?path=' + encodeURIComponent(it.image_url || it.image || '');
+ const lite = {
+ id: it.id, title: it.title, artist: it.artist, year: it.year, era: it.era,
+ imageProxy,
+ };
+ div.dataset.item = JSON.stringify(lite);
+ const img = document.createElement('img');
+ img.src = imageProxy;
+ img.loading = 'lazy';
+ img.alt = it.title || '';
+ const label = document.createElement('div');
+ label.className = 'tile-label';
+ label.textContent = it.artist || it.title || '—';
+ div.append(img, label);
+ div.addEventListener('dragstart', (e) => {
+ e.dataTransfer.effectAllowed = 'copy';
+ e.dataTransfer.setData('application/x-4sq', JSON.stringify({ kind: 'tile', item: lite }));
+ div.classList.add('dragging');
+ });
+ div.addEventListener('dragend', () => div.classList.remove('dragging'));
+ // Click-to-place fallback for touch / accessibility: place into first empty slot.
+ div.addEventListener('dblclick', () => {
+ for (const n of ['1','2','3','4']) {
+ if (!layout[n]) { layout[n] = lite; saveLayout(); renderSlots(); return; }
+ }
+ });
+ $tiles.appendChild(div);
+ }
+ }
+
+ async function fetchArtists() {
+ try {
+ const r = await fetch('/api/catalog/artists');
+ const j = await r.json();
+ const opts = (j.artists || []).map(a => `<option value="${escapeHtml(a)}">${escapeHtml(a)}</option>`).join('');
+ $artist.insertAdjacentHTML('beforeend', opts);
+ } catch {}
+ }
+ let qDebounce;
+ $q.addEventListener('input', () => { clearTimeout(qDebounce); qDebounce = setTimeout(fetchRail, 220); });
+ $artist.addEventListener('change', fetchRail);
+
+ document.getElementById('reset-all').addEventListener('click', () => {
+ if (!confirm('Clear all 4 squares?')) return;
+ layout = { 1: null, 2: null, 3: null, 4: null };
+ saveLayout(); renderSlots();
+ });
+
+ fetchArtists();
+ fetchRail();
+ </script>
+</body>
+</html>
diff --git a/server.js b/server.js
new file mode 100644
index 0000000..94f5bdc
--- /dev/null
+++ b/server.js
@@ -0,0 +1,102 @@
+// 4square.agentabrams.com — 2x2 design-showroom layout tool.
+// Drag tiles from the rail into one of 4 squares; layout persists in localStorage.
+// Image source is The Set Decorator catalog (proxied so no CORS).
+
+const express = require('express');
+const path = require('path');
+const http = require('http');
+const https = require('https');
+
+const PORT = parseInt(process.env.PORT || '9702', 10);
+const AUTH_USER = process.env.BASIC_AUTH_USER || 'admin';
+const AUTH_PASS = process.env.BASIC_AUTH_PASS || 'DWShowroom2026';
+const UPSTREAM = (process.env.CATALOG_UPSTREAM || 'https://thesetdecorator.com').replace(/\/$/, '');
+
+const app = express();
+
+// ── /health (NOT auth-gated, used by deploy.sh smoke test) ────────────────
+app.get('/health', (_req, res) => res.json({ ok: true, ts: new Date().toISOString() }));
+
+// ── Basic Auth gate (everything below this) ───────────────────────────────
+app.use((req, res, next) => {
+ const hdr = req.headers.authorization || '';
+ if (!hdr.startsWith('Basic ')) {
+ res.set('WWW-Authenticate', 'Basic realm="4Square Agent Abrams"');
+ return res.status(401).send('Authentication required');
+ }
+ let decoded;
+ try { decoded = Buffer.from(hdr.slice(6), 'base64').toString('utf8'); }
+ catch { return res.status(400).send('Bad auth header'); }
+ const idx = decoded.indexOf(':');
+ if (idx < 0) return res.status(400).send('Bad auth header');
+ const u = decoded.slice(0, idx);
+ const p = decoded.slice(idx + 1);
+ // Constant-time compare via crypto.timingSafeEqual when lengths match.
+ const crypto = require('crypto');
+ const uOK = u.length === AUTH_USER.length && crypto.timingSafeEqual(Buffer.from(u), Buffer.from(AUTH_USER));
+ const pOK = p.length === AUTH_PASS.length && crypto.timingSafeEqual(Buffer.from(p), Buffer.from(AUTH_PASS));
+ if (uOK && pOK) return next();
+ res.set('WWW-Authenticate', 'Basic realm="4Square Agent Abrams"');
+ return res.status(401).send('Invalid credentials');
+});
+
+// ── Catalog proxy → TSD ───────────────────────────────────────────────────
+// Frontend calls /api/catalog/search?... → we forward to thesetdecorator.com.
+// We also proxy /img/?path=<upstream-path> for image bytes so the browser
+// loads everything from this domain (no third-party-cookie / CORS surprises).
+function proxyJson(req, res, upstreamPath) {
+ const url = new URL(UPSTREAM + upstreamPath);
+ const lib = url.protocol === 'https:' ? https : http;
+ const upstream = lib.request({
+ method: 'GET',
+ hostname: url.hostname,
+ port: url.port || (url.protocol === 'https:' ? 443 : 80),
+ path: url.pathname + url.search,
+ headers: { 'User-Agent': '4square-agentabrams/0.1', 'Accept': 'application/json' },
+ }, (r) => {
+ res.status(r.statusCode || 502);
+ // Pass content-type through; default to JSON.
+ res.set('Content-Type', r.headers['content-type'] || 'application/json');
+ r.pipe(res);
+ });
+ upstream.on('error', (e) => res.status(502).json({ ok: false, error: 'upstream ' + e.message }));
+ upstream.end();
+}
+
+app.get('/api/catalog/search', (req, res) => {
+ const q = req.url.includes('?') ? req.url.slice(req.url.indexOf('?')) : '';
+ proxyJson(req, res, '/api/catalog/search' + q);
+});
+app.get('/api/catalog/artists', (req, res) => {
+ proxyJson(req, res, '/api/catalog/artists');
+});
+
+// Image bytes — explicit path param so we don't accidentally proxy arbitrary URLs.
+app.get('/img', (req, res) => {
+ const p = String(req.query.path || '');
+ // Allow ONLY upstream-relative paths under /api/art-archive/photos/<digit>/image/<size>.
+ if (!/^\/api\/art-archive\/photos\/\d+\/image\/(thumb|medium|preview)$/.test(p)) {
+ return res.status(400).send('bad path');
+ }
+ const url = new URL(UPSTREAM + p);
+ const lib = url.protocol === 'https:' ? https : http;
+ const upstream = lib.request({
+ method: 'GET',
+ hostname: url.hostname,
+ port: url.port || (url.protocol === 'https:' ? 443 : 80),
+ path: url.pathname,
+ headers: { 'User-Agent': '4square-agentabrams/0.1' },
+ }, (r) => {
+ res.status(r.statusCode || 502);
+ if (r.headers['content-type']) res.set('Content-Type', r.headers['content-type']);
+ res.set('Cache-Control', 'public, max-age=86400');
+ r.pipe(res);
+ });
+ upstream.on('error', (e) => res.status(502).send('upstream ' + e.message));
+ upstream.end();
+});
+
+// ── Static frontend ───────────────────────────────────────────────────────
+app.use(express.static(path.join(__dirname, 'public'), { extensions: ['html'] }));
+
+app.listen(PORT, () => console.log(`[4square-agentabrams] http://127.0.0.1:${PORT}`));
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