Add a summary report set from Markdown

from-markdown takes a hand-written summary such as SUMMARY.md and sets it
in the full report's dress: the same cover, header, footers, table of
contents, headings and grids. The shared macros move to macros.html.j2 so
both templates draw from them, and layout.render_pdf takes the template and
document title to use.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

report_generator/template/summary.html.j2

@@ -0,0 +1,36 @@
+{#
+  The summary report, set from a Markdown file in the dress of the full report: the same cover,
+  running header and footers, table of contents and headings, with the body in between.
+
+  The body arrives already rendered -- :mod:`summary` turns the Markdown into HTML whose elements
+  are the ones `report.css` already styles -- so this file only places it. The context this expects
+  is described by `summary.CONTEXT`.
+#}
+{% from "macros.html.j2" import facts %}
+
+<div class="page-header"><img src="{{ cover.logo }}" alt="CipherCell" /></div>
+<span class="footer-scan">{{ cover.footer }}</span>
+<span class="footer-date">{{ cover.footer_date }}</span>
+
+<div class="cover-mark">
+  <img src="{{ cover.logo }}" alt="CipherCell" />
+</div>
+
+<div class="cover-title">{{ cover.title }}</div>
+
+{{ facts(cover.identity) }}
+
+{% if cover.intro %}
+  <div class="prose cover-intro">{{ cover.intro }}</div>
+{% endif %}
+
+{% if contents %}
+  <h1 style="break-before: page">Table of Contents</h1>
+  <ol class="toc">
+    {% for entry in contents %}
+      <li><a href="#{{ entry.id }}">{{ entry.title }}</a></li>
+    {% endfor %}
+  </ol>
+{% endif %}
+
+<div class="prose">{{ body }}</div>