LANTERN purge: delete the superseded base/expedition shell (audit H1/H3/M5)

The 2026-08-06 audit found the shipping scene was still the abandoned
co-op-Hades game with LANTERN combat bolted on, and that a third of the
codebase was live code for a direction abandoned on 2026-07-13. Operator
chose deletion over freezing: "everything is saved in source control if
needed. I want the project to be clean."

DELETED (~140 source files, Scripts 335->231, Tests 77->43):
- Enemy variants + boss (H3). ChargerAuthoring / SpitterAuthoring /
  SwarmerAuthoring were attached to ZERO prefabs, so LungeState /
  SpitterState / SwarmerTag were never baked: ~272 lines of Bursted AI
  passes, BossAISystem (261 lines) and the whole MixBands escalation
  curve could not match a single chunk at runtime, while 734 lines of
  green tests certified them. Both shipping enemy prefabs were already
  byte-identical in stats.
- Run/room lifecycle: RunDirector FSM, RunInfo/RunMap/RoomPlan/RoomTag,
  route select, portal interact, ready-check, room field/teardown.
- Meta shop, prep loadout, boons (incl. KillRewardSystem and
  DashTrailDamageSystem, which existed only to serve boon flags).
- Build palette + structures, shared storage, inventory/equipment
  (already recorded PAUSED in CLAUDE.md).
- The HUD panels driving all of the above (HudSystem 1168 -> 610).

KEPT deliberately: BaseGridMath + BaseAnchor (8 systems use PlotCenter
for spawn rings, respawn and dynamic light), the resource ledger +
StorageMath, the save system, region/relevancy. Three of these were in
the delete set until I checked their consumers — worth remembering that
the file-level manifest was wrong about them.

Also folds in audit finding M5: PlayerClass was a second, server-only
copy of the byte FrameId already replicates. It existed for the meta
shop; with that gone, FrameId is the single frame identity.

Harvest is now single-sink (ledger). HarvestMath keeps its shape so
LANTERN's carried-vs-banked cargo split lands in one place, not two.

295/295 EditMode green, zero compile errors. Subscene re-bake and Play
validation follow in the next commit.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Assets/_Project/Scripts/Server/Persistence/SaveWriteSystem.cs

@@ -37,19 +37,12 @@ namespace ProjectM.Server
                 rows[i] = new LedgerRow { ItemId = buffer[i].ItemId, Count = buffer[i].Count };
 
             // Persist player-built structures (single shared scan; drift-proof vs the quit-to-menu writer).
-            uint nowTick = SystemAPI.GetSingleton<NetworkTime>().ServerTick.TickIndexForValidTick;
-            SaveStructureScan.Collect(EntityManager, nowTick, out var structures);
-            // v6: the permanent-meta slice via the ONE shared collector.
-            MetaSaveScan.Collect(EntityManager, dir, out var metaRows, out var runsCompleted, out var maxDepth);
-
+            // 2026-08-07 audit purge: structures and the permanent-meta slice are deleted; the save now carries
+            // the LEDGER only. SaveData keeps its Structures / MetaUpgrades / RunsCompleted / MaxDepthReached
+            // fields so a v7 file written before the purge still loads — they are simply written empty now.
             SaveService.Save(new SaveData
             {
-                RunsCompleted = runsCompleted,
-                MaxDepthReached = maxDepth,
-                MetaUpgrades = metaRows,
-
                 Ledger = rows,
-                Structures = structures,
                 SavedAtMs = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds(),
             });
         }