docs: shareable URLs per document (0.87.0)

the docs site kept the selected document only in React state, so you couldn't
bookmark, share, or refresh-into a specific doc, and browser back/forward did
nothing — a real gap for a developer docs site people want to link into.

- each doc now has a slug URL: docs.amerc.ai/#/connect-your-broker
- selecting a doc pushes the slug to the URL (history.pushState)
- loading a #/<slug> URL lands directly on that doc; unknown/empty falls back
  to Quickstart as before
- hashchange + popstate listeners make browser back/forward switch docs
- the browser tab title now reflects the open doc (<title> · Docs · amerc)
- verified live on docs.amerc.ai: click updates URL+view+title, deep-links
  land correctly, back/forward navigate between docs

index.html

@@ -17,7 +17,7 @@
       @media (prefers-reduced-motion: reduce) { .app-loading-gem { animation: none; transform: rotate(45deg); } }
     </style>
     <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="0.86.0-ogcard" />
+    <meta name="version" content="0.87.0-docroute" />
     <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": "0.86.0-ogcard",
+  "version": "0.87.0-docroute",
   "private": true,
   "type": "module",
   "scripts": {

src/DocsApp.jsx

@@ -22,6 +22,9 @@ function highlightCode(code) {
   return out + esc(code.slice(last));
 }
 
+// URL-safe slug from a doc title, for shareable #/<slug> doc links.
+const slugify = (s) => String(s || '').toLowerCase().replace(/[^a-z0-9]+/g, '-').replace(/^-+|-+$/g, '') || 'doc';
+
 function DocsWorkspace({ canEdit }) {
   const [docs, setDocs] = useState([]);
   const [sel, setSel] = useState(null);
@@ -35,15 +38,33 @@ function DocsWorkspace({ canEdit }) {
   const loadList = useCallback(async () => {
     try {
       const d = await api('/docs'); const list = d.docs || []; setDocs(list);
-      // land on a useful doc instead of an empty "select a document"
-      const def = list.find((x) => /quickstart/i.test(x.title)) || list.find((x) => x.folder === 'start here') || list[0];
+      // land on the doc named in the URL hash, else a useful default
+      const slug = window.location.hash.replace(/^#\/?/, '');
+      const fromHash = slug && list.find((x) => slugify(x.title) === slug);
+      const def = fromHash || list.find((x) => /quickstart/i.test(x.title)) || list.find((x) => x.folder === 'start here') || list[0];
       if (def) setSel((cur) => cur ?? def.id);
     } catch (e) { setErr(e.message); }
   }, []);
   useEffect(() => { loadList(); }, [loadList]);
+  // shareable doc URLs: select via #/<slug>, and follow browser back/forward
+  const openDoc = useCallback((d) => {
+    setSel(d.id);
+    const slug = slugify(d.title);
+    if (window.location.hash !== `#/${slug}`) window.history.pushState(null, '', `${window.location.pathname}${window.location.search}#/${slug}`);
+  }, []);
+  useEffect(() => {
+    const onHash = () => {
+      const slug = window.location.hash.replace(/^#\/?/, '');
+      const d = docs.find((x) => slugify(x.title) === slug);
+      if (d) setSel(d.id);
+    };
+    window.addEventListener('hashchange', onHash);
+    window.addEventListener('popstate', onHash);
+    return () => { window.removeEventListener('hashchange', onHash); window.removeEventListener('popstate', onHash); };
+  }, [docs]);
   useEffect(() => {
     if (sel == null) { setDoc(null); return; }
-    api(`/docs/${sel}`).then((d) => { setDoc(d.doc); setDraft({ title: d.doc.title, folder: d.doc.folder, body: d.doc.body }); setEditing(false); }).catch((e) => setErr(e.message));
+    api(`/docs/${sel}`).then((d) => { setDoc(d.doc); setDraft({ title: d.doc.title, folder: d.doc.folder, body: d.doc.body }); setEditing(false); document.title = `${d.doc.title} · Docs · amerc`; }).catch((e) => setErr(e.message));
   }, [sel]);
   // decorate rendered code blocks with a hover copy button
   useEffect(() => {
@@ -83,7 +104,7 @@ function DocsWorkspace({ canEdit }) {
             <div key={f} className="docs-folder">
               <div className="docs-folder-name">{f || '📁 root'}</div>
               {folders[f].map((d) => (
-                <button key={d.id} className={`docs-item${sel === d.id ? ' on' : ''}`} onClick={() => setSel(d.id)}>{d.title}</button>
+                <button key={d.id} className={`docs-item${sel === d.id ? ' on' : ''}`} onClick={() => openDoc(d)}>{d.title}</button>
               ))}
             </div>
           ))}

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 = '0.86.0-ogcard';
+const RELEASE = '0.87.0-docroute';
 
 const NAV = [
   { id: 'home', label: 'Tavern' },