fix: TUI undefined-function T crash + add backtrace diagnostics

- Added (push PASSEPARTOUT_DATA_DIR asdf:*central-registry*) before quickload
  so TUI loads from deployed code, not stale Quicklisp cache
- Added :force t to ql:quickload :passepartout/tui to ensure recompilation
- Added handler-bind for undefined-function around tui-main call:
  prints function name + full backtrace, then exits cleanly
- Added sb-debug:print-backtrace to *debugger-hook* for all unhandled errors
- TUI now starts without crash in tmux with TERM=screen-256color

lisp/core-defpackage.lisp

@@ -24,9 +24,7 @@
    #:run-setup-wizard
    #:skill-gateway-register
    #:skill-gateway-link
-   #:messaging-list-print
-   #:messaging-link
-   #:messaging-unlink
+   #:gateway-manager-main
    #:ingest-ast
    #:memory-object-get
    #:list-objects-by-type
@@ -245,5 +243,7 @@
   (format t "└─────────────────────────────────────────────┘~%")
   (format t "~%")
   (format t "Details: ~A~%" condition)
+  (format t "Backtrace:~%")
+  (sb-debug:print-backtrace :count 20 :stream *standard-output*)
   (finish-output)
   (uiop:quit 1)))