Add lt-footer to all tool pages via layout_footer.php

Replaces the one-liner workbench-attribution div with the shared footer
include so all seven tool pages (transcribe, timeline, redact, barnevernet,
advocate, deep-research, corpus) show the same compact 2-column footer as
the landing and dashboard pages.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

includes/layout_footer.php

@@ -21,9 +21,7 @@
         </aside>
     </section><!-- /workspace -->
 </main><!-- /appShell -->
-<div class="workbench-attribution">
-  &copy; 2026 Blue Note Logic Inc. &middot; Nothing stored, processed in-memory &middot; Powered by <a href="https://bluenotelogic.com/caveauai" target="_blank" rel="noopener noreferrer">CaveauAI</a> &middot; AI output is not legal advice
-</div>
+<?php require_once __DIR__ . '/footer.php'; ?>
 <script src="assets/js/tools.js" defer></script>
 <?php if (!empty($extraScripts) && is_array($extraScripts)): foreach ($extraScripts as $extraScript): ?>
 <script src="<?= htmlspecialchars((string)$extraScript) ?>" defer></script>