fix(terminal): address review: Key tester isolates shortcuts, Codex stays on line feed

- app.js: the shortcut dispatcher returns early for events aimed at a data-raw-keys
  field, so Ctrl+W / Ctrl+L / Escape / Alt+1 / Ctrl+K pressed in the Key tester no
  longer kill the session, clear the terminal or close Settings
- stock.ts: drop Codex's esc-enter (a line feed works); no stock CLI declares a chord.
  The esc-enter path is tested through a clis.json override
- tests: unused port (3194), Ctrl+Enter asserts no keypress, shortcut-isolation test
  (verified to fail without the guard)
- docs/comments point at capabilities.newline; set-input class, trailing whitespace

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

src/web/public/app.js

@@ -1242,6 +1242,12 @@ class CodemanApp {
 
     // Use capture to handle before terminal
     document.addEventListener('keydown', (e) => {
+      // A field that exists to show what a key does (Settings → Key tester, `data-raw-keys`) must
+      // receive every chord untouched. Without this, probing Ctrl+W killed the active session,
+      // Ctrl+L cleared the terminal and Escape closed Settings: this listener runs in the capture
+      // phase, before the field's own handler. Must stay the first statement.
+      if (e.target?.closest?.('[data-raw-keys]')) return;
+
       // Don't intercept keys during CJK IME composition
       if (e.isComposing || e.keyCode === 229) return;
 

src/web/public/index.html

@@ -1822,7 +1822,7 @@
                   </div>
                 </div>
               </div>
-            
+
               <div class="set-group">
                 <div class="set-group-head"><h4>Key tester</h4><span class="set-scope">device</span></div>
                 <div class="set-group-body">
@@ -1831,7 +1831,7 @@
                       <span class="set-row-label">Key tester</span>
                       <span class="set-row-desc">Click the box and press keys to see what this browser reports (key, code, modifiers) for keydown, keypress and keyup. Useful when a shortcut such as Shift+Enter behaves differently on one device. Nothing is sent to a session.</span>
                     </div>
-                    <input type="text" id="keyTesterInput" class="set-select" readonly autocomplete="off" spellcheck="false"
+                    <input type="text" id="keyTesterInput" class="set-input" data-raw-keys readonly autocomplete="off" spellcheck="false"
                       placeholder="Click here, then press keys"
                       onkeydown="app.keyTesterEvent(event)" onkeypress="app.keyTesterEvent(event)" onkeyup="app.keyTesterEvent(event)">
                   </div>