docs: land on Quickstart instead of an empty pane (0.76.0)

- visiting docs.amerc.ai showed a blank 'Select or create a document' main
  area — a poor first impression for the public docs/onboarding surface
- auto-select a sensible default on load (Quickstart -> a 'start here' doc ->
  first doc) without overriding a user's later selection
- verified live: docs.amerc.ai lands on Quickstart, sidebar highlights it

index.html

@@ -4,7 +4,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <meta name="theme-color" content="#0e0a14" />
     <meta name="description" content="amerc is the agent mercenary tavern — hire, run, publish, and remotely deliver AI agents across software boundaries. No infrastructure, just skills." />
-    <meta name="version" content="0.75.0-esc" />
+    <meta name="version" content="0.76.0-docsland" />
     <link rel="icon" href="/favicon.svg" type="image/svg+xml" />
     <link rel="icon" href="/app-192.png" type="image/png" sizes="192x192" />
     <link rel="apple-touch-icon" href="/apple-touch-icon.png" />

package.json

@@ -1,6 +1,6 @@
 {
   "name": "amerc-site",
-  "version": "0.75.0-esc",
+  "version": "0.76.0-docsland",
   "private": true,
   "type": "module",
   "scripts": {

src/DocsApp.jsx

@@ -33,7 +33,12 @@ function DocsWorkspace({ canEdit }) {
   const renderRef = useRef(null);
 
   const loadList = useCallback(async () => {
-    try { const d = await api('/docs'); setDocs(d.docs || []); } catch (e) { setErr(e.message); }
+    try {
+      const d = await api('/docs'); const list = d.docs || []; setDocs(list);
+      // land on a useful doc instead of an empty "select a document"
+      const def = list.find((x) => /quickstart/i.test(x.title)) || list.find((x) => x.folder === 'start here') || list[0];
+      if (def) setSel((cur) => cur ?? def.id);
+    } catch (e) { setErr(e.message); }
   }, []);
   useEffect(() => { loadList(); }, [loadList]);
   useEffect(() => {

src/Scene2D.jsx

@@ -10,7 +10,7 @@ import { api } from './api.js';
 const Menu = ({ size = 20 }) => (<svg width={size} height={size} viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" aria-hidden="true"><line x1="3" y1="6" x2="21" y2="6" /><line x1="3" y1="12" x2="21" y2="12" /><line x1="3" y1="18" x2="21" y2="18" /></svg>);
 const X = ({ size = 20 }) => (<svg width={size} height={size} viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" aria-hidden="true"><line x1="18" y1="6" x2="6" y2="18" /><line x1="6" y1="6" x2="18" y2="18" /></svg>);
 
-const RELEASE = '0.75.0-esc';
+const RELEASE = '0.76.0-docsland';
 
 const NAV = [
   { id: 'home', label: 'Tavern' },