Dev console: money, items, upgrades, free build, speed (t66)

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

src/shell.html

@@ -130,6 +130,12 @@
   </div>
 </div>
 
+<section id="dev-console" class="plate" aria-labelledby="dev-title" hidden>
+  <div class="dev-head"><strong id="dev-title">Dev console</strong><span class="note">World marked · help lists commands</span><button id="dev-close" class="iconbtn" aria-label="Close dev console">Close <kbd>Esc</kbd></button></div>
+  <div id="dev-output" role="log" aria-label="Command output" aria-live="polite"></div>
+  <form id="dev-form"><label for="dev-input">Command</label><input id="dev-input" type="text" autocomplete="off" spellcheck="false" placeholder="help"><button class="btn" type="submit">Run</button></form>
+</section>
+
 <script>
 //__JS__
 </script>