Initial implementation of mcq — document reading queue

Single-binary service: push raw markdown via REST/gRPC API, read rendered
HTML through mobile-friendly web UI. MCIAS auth on all endpoints, SQLite
storage, goldmark rendering with GFM and syntax highlighting.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

web/templates/read.html

@@ -0,0 +1,27 @@
+{{define "title"}} — {{.Doc.Title}}{{end}}
+{{define "content"}}
+<div class="read-header">
+    <h2>{{.Doc.Title}}</h2>
+    <div class="read-meta">
+        <span>Pushed by {{.Doc.PushedBy}}</span>
+        <span>{{.Doc.PushedAt}}</span>
+    </div>
+    <div class="read-actions">
+        {{if .Doc.Read}}
+        <form method="POST" action="/d/{{.Doc.Slug}}/unread" style="display:inline">
+            {{csrfField}}
+            <button type="submit" class="btn-ghost btn btn-sm">Mark unread</button>
+        </form>
+        {{else}}
+        <form method="POST" action="/d/{{.Doc.Slug}}/read" style="display:inline">
+            {{csrfField}}
+            <button type="submit" class="btn-ghost btn btn-sm">Mark read</button>
+        </form>
+        {{end}}
+        <a href="/" class="btn-ghost btn btn-sm">Back to queue</a>
+    </div>
+</div>
+<div class="card markdown-body">
+    {{.HTML}}
+</div>
+{{end}}