diff --git a/mockups/html-preview.html b/mockups/html-preview.html
deleted file mode 100644
index 191ee5a..0000000
--- a/mockups/html-preview.html
+++ /dev/null
@@ -1,147 +0,0 @@
-<!doctype html>
-<html lang="en">
-<head>
-<meta charset="utf-8">
-<meta name="viewport" content="width=device-width, initial-scale=1">
-<title>HTML Preview Options</title>
-<style>
-:root {
-  --bg: #eceef1; --frame: #f7f8fa; --line: #c9ced6; --ink: #1f2430; --muted: #5b6372;
-  --bar: #d9dde3; --task: #c2417a; --task-soft: rgba(194,65,122,.12); --lead: #2f6db5;
-  --bubble: #e1e6ee; --warn: #9a6a00; --warn-soft: rgba(196,140,0,.14); --page: #ffffff;
-}
-@media (prefers-color-scheme: dark) {
-  :root:not([data-theme="light"]) {
-    --bg: #15181e; --frame: #1c2028; --line: #353b47; --ink: #e4e7ec; --muted: #a3abb8;
-    --bar: #3a404c; --task: #f08ab5; --task-soft: rgba(240,138,181,.12); --lead: #7fb2ee;
-    --bubble: #26303f; --warn: #e8b84a; --warn-soft: rgba(232,184,74,.14); --page: #232833;
-  }
-}
-:root[data-theme="dark"] {
-  --bg: #15181e; --frame: #1c2028; --line: #353b47; --ink: #e4e7ec; --muted: #a3abb8;
-  --bar: #3a404c; --task: #f08ab5; --task-soft: rgba(240,138,181,.12); --lead: #7fb2ee;
-  --bubble: #26303f; --warn: #e8b84a; --warn-soft: rgba(232,184,74,.14); --page: #232833;
-}
-* { box-sizing: border-box; }
-body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.45 -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif; }
-main { max-width: 1240px; margin: 0 auto; padding: 32px 16px 64px; }
-h1 { font-size: 26px; margin: 0 0 6px; }
-h2 { font-size: 19px; margin: 40px 0 6px; }
-p.cap { color: var(--muted); margin: 0 0 14px; max-width: 900px; }
-.screen { display: flex; gap: 14px; align-items: flex-start; flex-wrap: wrap; }
-.app { flex: 1 1 640px; min-width: 0; border: 1px solid var(--line); border-radius: 10px; background: var(--frame); overflow: hidden; }
-.app .win { display: grid; grid-template-columns: 1fr 1fr; height: 380px; }
-.pane { border-right: 1px solid var(--line); display: flex; flex-direction: column; min-width: 0; }
-.pane:last-child { border-right: 0; }
-.tabs { display: flex; gap: 6px; padding: 7px 9px; border-bottom: 1px solid var(--line); font-size: 12px; color: var(--muted); }
-.tabs span { padding: 2px 7px; border-radius: 5px; }
-.tabs .on { background: var(--bar); color: var(--ink); }
-.body { padding: 10px; display: flex; flex-direction: column; gap: 8px; flex: 1; min-height: 0; font-size: 12.5px; }
-.msg { background: var(--bubble); border-radius: 8px; padding: 7px 9px; }
-.q { border: 1px solid var(--warn); background: var(--warn-soft); border-radius: 8px; padding: 8px 10px; }
-.q b { display: block; margin-bottom: 4px; }
-.q .opt { margin: 2px 0; }
-.link { color: var(--lead); text-decoration: underline; }
-.sheet { flex: 1; display: flex; flex-direction: column; border-top: 3px solid var(--task); background: var(--task-soft); min-height: 0; }
-.sheet .head { display: flex; justify-content: space-between; padding: 6px 9px; font-size: 12px; border-bottom: 1px solid var(--line); }
-.sheet .head .t { color: var(--task); font-weight: 600; }
-.page { flex: 1; margin: 8px; background: var(--page); border: 1px solid var(--line); border-radius: 6px; padding: 10px; overflow: hidden; font-size: 11.5px; }
-.page h4 { margin: 0 0 6px; font-size: 13px; }
-.mini { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; height: 70px; border: 1px solid var(--line); border-radius: 4px; margin: 6px 0; }
-.mini div { border-right: 1px solid var(--line); }
-.mini .s { background: var(--task-soft); border-top: 2px solid var(--task); }
-.browser { flex: 0 1 420px; min-width: 260px; border: 1px solid var(--line); border-radius: 10px; background: var(--frame); overflow: hidden; }
-.browser .bar { display: flex; gap: 6px; padding: 6px 9px; border-bottom: 1px solid var(--line); font-size: 11.5px; color: var(--muted); }
-.browser .bar span { padding: 2px 7px; border-radius: 5px; background: var(--bar); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 130px; }
-.browser .bar .on { color: var(--ink); background: var(--bg); border: 1px solid var(--line); }
-.browser .page { height: 300px; }
-.label { font-size: 12px; color: var(--muted); margin: 6px 2px; }
-ul.gets { margin: 12px 0 0; padding-left: 20px; max-width: 980px; }
-ul.gets li { margin: 3px 0; }
-.mac { font-size: 11px; color: var(--muted); padding: 4px 9px; border-top: 1px solid var(--line); }
-</style>
-</head>
-<body>
-<main>
-<h1>Where should an agent's HTML page show?</h1>
-<p class="cap">Same case for both: the "Left-side task context" agent asks ian to pick between mockups 3a and 3b, which live in <code>mockups/left-layer.html</code> (a 25&nbsp;KB page whose sections are drawn by JavaScript and follow light/dark mode). Then it adds two more wireframes to the file and asks again.</p>
-
-<h2>1. Browser, as today</h2>
-<p class="cap">The agent calls <code>client_open</code>. The browser comes forward on murky over byre's window. Each call copies the file into a new folder, so the second round opens a second tab; the first tab still shows the old page.</p>
-<div class="screen">
-  <div class="app">
-    <div class="win">
-      <div class="pane">
-        <div class="tabs"><span class="on">Lead</span><span>Notes</span><span>Workflows</span><span>Status</span></div>
-        <div class="body"><div class="msg">Lead: the Left-side task agent has a question for you.</div></div>
-      </div>
-      <div class="pane">
-        <div class="tabs"><span class="on">Transcript</span><span>Changes</span><span>Files</span></div>
-        <div class="body">
-          <div class="q"><b>Which middle ground, 3a or 3b?</b>
-            <div class="opt">( ) 3a — sheet covers the lead, no tabs</div>
-            <div class="opt">(•) 3b — attached sheet with the task's tabs</div>
-            <div style="color:var(--muted);margin-top:4px">The wireframes are open in your browser.</div>
-          </div>
-        </div>
-      </div>
-    </div>
-    <div class="mac">byre window — behind the browser until ian switches back</div>
-  </div>
-  <div class="browser">
-    <div class="bar"><span>…/open/7f3a/left-layer.html</span><span class="on">…/open/c91e/left-layer.html</span></div>
-    <div class="page">
-      <h4>Attached Sheet Mockups</h4>
-      <div>3a. Sheet covers the lead</div>
-      <div class="mini"><div class="s"></div><div></div></div>
-      <div>3b. Attached sheet with tabs</div>
-      <div class="mini"><div class="s"></div><div></div></div>
-      <div style="color:var(--muted)">Full width, real browser: JS, dark mode, ⌘F, zoom, print, dev tools.</div>
-    </div>
-  </div>
-</div>
-<ul class="gets">
-  <li><b>Gets:</b> nothing new to build or maintain; every page works exactly as written (JS, fonts, dark mode); full browser width and tools; the "no web view" rule stays.</li>
-  <li><b>Gives up:</b> the page and the question are in two windows; ian switches back and forth to compare 3a/3b against the options; stale tabs pile up after each revision; it takes the screen on murky every time.</li>
-</ul>
-
-<h2>2. Built-in page view in the left sheet</h2>
-<p class="cap">The question carries the page as an attachment (or ian clicks <code>left-layer.html</code> in Files, or a preview link). The page opens in the attached sheet over the lead pane, the way 3b opens Changes or Files, with the question still on the right. When the agent edits the file, the sheet reloads in place. Needs a <code>WKWebView</code>.</p>
-<div class="screen">
-  <div class="app" style="flex-basis:100%">
-    <div class="win" style="height:420px">
-      <div class="pane">
-        <div class="tabs"><span>Lead</span><span>Notes</span><span>Workflows</span><span>Status</span></div>
-        <div class="sheet">
-          <div class="head"><span class="t">Left-side task context · left-layer.html</span><span>↗ Browser &nbsp; ✕</span></div>
-          <div class="page">
-            <h4>Attached Sheet Mockups</h4>
-            <div>3a. Sheet covers the lead</div>
-            <div class="mini"><div class="s"></div><div></div></div>
-            <div>3b. Attached sheet with tabs</div>
-            <div class="mini"><div class="s"></div><div></div></div>
-            <div style="color:var(--muted)">Half the window wide. Reloads when the agent changes the file.</div>
-          </div>
-        </div>
-      </div>
-      <div class="pane">
-        <div class="tabs"><span class="on">Transcript</span><span>Changes</span><span>Files</span><span>Page</span></div>
-        <div class="body">
-          <div class="q"><b>Which middle ground, 3a or 3b?</b>
-            <div class="opt">( ) 3a — sheet covers the lead, no tabs</div>
-            <div class="opt">(•) 3b — attached sheet with the task's tabs</div>
-            <div style="margin-top:4px"><span class="link">left-layer.html</span> <span style="color:var(--muted)">— showing on the left</span></div>
-          </div>
-        </div>
-      </div>
-    </div>
-    <div class="mac">One byre window. Nothing else comes forward.</div>
-  </div>
-</div>
-<ul class="gets">
-  <li><b>Gets:</b> page and question side by side in one window; the page refreshes in place after each revision; nothing takes the screen; works the same on every Mac without copying files.</li>
-  <li><b>Gives up:</b> reverses "no web view, under any circumstances" in <code>docs/macos.md</code>; a WebKit view inside the app that runs agent-written JavaScript; half the window wide, so a 1240px-wide mockup page is cramped (a ↗ Browser button stays for that); a one-file page like left-layer.html loads through the existing worktree file endpoint, but a page with its own CSS or image files next to it needs those served too; one more view kind to keep working.</li>
-</ul>
-</main>
-</body>
-</html>