test: update main game launch and hot reload coverage

Enter through LauncherPlay and reload cthangover_game, which owns the starter party. Report missing mods, incompatible versions and collection problems when a game is unavailable.

test_suites/new_game/manifest.json

@@ -1,6 +1,6 @@
 {
   "name": "New Game Flow Test",
-  "description": "End-to-end play like a player in one process: front-end menu → Play → the cthangover card → New game → in-process mod-set switch → the prologue in prolog_alley with Marao's dialog → in-game hot reload of cthangover_party (session restored) → menu → novel_template → menu → cthangover again; every released mod context must be collected. Activated only by --itest=new_game (with --frontend).",
+  "description": "End-to-end play like a player in one process: front-end menu → Play → the cthangover card → New game → in-process mod-set switch → the prologue in prolog_alley with Marao's dialog → in-game hot reload of cthangover_game (session restored) → menu → novel_template → menu → cthangover again; every released mod context must be collected. Activated only by --itest=new_game (with --frontend).",
   "sources": [
     "src/*.cs"
   ]