test(client): live atlas generation-overlay inspection scenario (#960)

atlas_gen_open opens the real atlas app via HudGroups, navigates to GJ71c's
regional screen, and enables the Layer-1 overlays — exercising the production
opener + the live request→cascade→render pipeline against a --test-mode server
(SR_LIVE=1). Capture with: tests/run-visual --screenshot atlas_gen_open.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/visual.json

@@ -72,6 +72,10 @@
     "implant_pending": {
       "ticks": 1,
       "description": "ImplantPending — diegetic Layer-1 generating indicator (#960)"
+    },
+    "atlas_gen_open": {
+      "ticks": 240,
+      "description": "Live: real atlas opener (HudGroups) + GJ71c Layer-1 overlays (#960)"
     }
   },
   "flows": {