fix(mesh): fix archy-rnodeconf exiting 1 on success (frozen exit() gotcha)

Confirmed on the just-packaged binary: `archy-rnodeconf --info` printed
everything correctly, then crashed with NameError: name 'exit' is not
defined and returned exit code 1. rnodeconf.py's own graceful_exit() calls
the bare exit() builtin, which is only ever defined by site.py for
interactive Python — a frozen PyInstaller app skips that init, so any
bundled script relying on it hits this the moment it tries to quit cleanly,
after the real work already succeeded. Classic, well-documented PyInstaller
gotcha; the standard fix is a runtime hook pre-defining exit/quit as
sys.exit before the bundled script's own code runs.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

reticulum-daemon/pyi_rthook_exit_builtins.py

@@ -0,0 +1,18 @@
+# PyInstaller runtime hook — see build.sh.
+#
+# `exit()`/`quit()` aren't part of the language; they're `site.Quitter`
+# instances the interactive interpreter injects into builtins at startup
+# (site.py). A frozen PyInstaller app never runs that interactive-mode
+# init, so any bundled script that calls bare `exit()` (RNS's own
+# rnodeconf.py does, in its graceful_exit() cleanup path) hits
+# `NameError: name 'exit' is not defined` right as it tries to quit
+# cleanly — the real work above it already completed, but the process
+# still exits 1, which is a foot-gun for anything scripting off the exit
+# code. Pre-define both as sys.exit so that path is a no-op crash-wise.
+import builtins
+import sys
+
+if not hasattr(builtins, "exit"):
+    builtins.exit = sys.exit
+if not hasattr(builtins, "quit"):
+    builtins.quit = sys.exit