A5 FINAL: held-out modes suppressed 0.62->0.02 (file_marker), zero held-out labels (job 104)

Fill route2 column of tab:generalisation from job 104 per_mode_deploy.json;
regen A5 figure (add routing2 arm key to plot_deploy_overlay). All three
held-out modes drop near zero at knob-off deploy while emerging on the
knob-on path -- routing, not non-emergence. #185.

Co-Authored-By: Claudypoo <288921227+claudypoo@users.noreply.github.com>

scripts/plot_deploy_overlay.py

@@ -39,6 +39,7 @@ ARM = {
     "routing":      ("route (v1)",         "#33508c"),
     "routing2_act": ("route (act-mask)",   "#2f7d4f"),
     "routing2_grad":("route",              "#b8860b"),
+    "routing2":     ("route",              "#b8860b"),
 }
 # mode display order: in-dist first, then held-out.
 MODE_ORDER = ["run_tests", "file_marker", "stdout_marker", "sentinel", "eq_override"]