TUI: colored rendering + LLM routing fix + /eval REPL

- Colored chat: green user, white agent, yellow system, cyan input
- Clean handshake display (Connected v0.2.0)
- LLM routing fix: action-dispatch routes to :tui when reply-stream present
- /eval command works with proper *package* binding
- Swank REPL on port 4006 (configurable)
- Backspace support with Croatoan integer key codes
- Confirmed end-to-end: type message → LLM responds → displayed in TUI
- Chat messages truncated with :n to prevent overlap

lisp/core-loop-act.lisp

@@ -39,12 +39,18 @@
              (source (proto-get meta :source))
              (raw-target (or (proto-get action :target) source *actuator-default*))
              (target (intern (string-upcase (string raw-target)) :keyword))
-             (actuator-fn (gethash target *actuator-registry*)))
+             ;; If target is :SYSTEM and we have a live reply-stream, route to :TUI instead
+             (actual-target (if (and (eq target :system)
+                                     (getf meta :reply-stream)
+                                     (ignore-errors (open-stream-p (getf meta :reply-stream))))
+                               :tui
+                               target))
+             (actuator-fn (gethash actual-target *actuator-registry*)))
         (when (and meta (null (getf action :meta)))
           (setf (getf action :meta) meta))
         (if actuator-fn
             (funcall actuator-fn action context)
-            (log-message "ACT ERROR: No actuator registered for '~s'" target))))))
+            (log-message "ACT ERROR: No actuator registered for '~s'" actual-target))))))
 
 (defun action-system-execute (action context)
   "Execute internal harness commands."