v0.4.0: TUI differentiator visualization — gate trace, rule counter, focus map

Gate trace: cognitive-verify accumulates (:gate name :result status) for
each deterministic gate. Trace prepended to action plist via list*.
TUI on-daemon-msg extracts :gate-trace and stores on message object.
add-msg accepts &key gate-trace for future rendering (collapsible Tab).

Rule counter: TUI actuator enriches response payload with :rule-count
=(hash-table-count *hitl-pending*). TUI status bar shows 'Rules:N'.

Focus map: TUI actuator adds :foveal-id from signal context. TUI stores
in state and renders second status line '[Focus: id]'.

Status bar: now two lines — line 1 (connection, mode, msgs, scroll,
rules, thinking spinner), line 2 (focus map, timestamp).

Test: 112/0 across 14 suites (reason 15/0 including gate-trace assertions)

lisp/gateway-tui-main.lisp

@@ -182,10 +182,15 @@
 (defun on-daemon-msg (msg)
   (let* ((payload (getf msg :payload))
          (text (getf payload :text))
-         (action (getf payload :action)))
+         (action (getf payload :action))
+         (gate-trace (getf msg :gate-trace))
+         (rule-count (getf payload :rule-count))
+         (foveal-id (getf payload :foveal-id)))
+    (when rule-count (setf (st :rule-count) rule-count))
+    (when foveal-id (setf (st :foveal-id) foveal-id))
     (cond
       (text (setf (st :busy) nil)
-            (add-msg :agent text))
+            (add-msg :agent text :gate-trace gate-trace))
       ((eq action :handshake)
        (add-msg :system (format nil "Connected v~a" (getf payload :version))))
       (t (add-msg :agent (format nil "~a" msg))))))