Inventory: per-player items backbone (DR-026 Phase 0)

Data-driven ItemDatabase catalog + per-player replicated InventorySlot ([GhostField] OwnerSendType.All, a StatModifier twin). Harvest reroutes to the firing player's personal inventory (optional ComponentLookup<GhostOwner> in ResourceHarvestSystem; remainder/un-owned -> ledger); the G-key InventoryDepositRequest RPC moves the bag into the shared ledger the build economy spends. Catalog asset (Aether/Ore/Biomass + Stone Pickaxe) wired into the Gameplay subscene; read-only HUD inventory panel. ushort ItemId subsumes ResourceId; byte Category/Tier baked for gear-tier progression. Session-only (no SaveData bump).

Play-validated host+client: catalog baked into both worlds, the re-baked player ghost carries InventorySlot with a clean handshake, a server write replicates to the client owner, the deposit RPC round-trips, and the HUD renders catalog names. See DR-026.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Assets/_Project/Scripts/Authoring/Player/PlayerAuthoring.cs

@@ -67,6 +67,8 @@ namespace ProjectM.Authoring
 
                 // Empty replicated modifier stack (grown by upgrades/pickups/debug hook, server-authoritative).
                 AddBuffer<StatModifier>(entity);
+                // Empty replicated personal inventory (server-authoritative; harvest yield + deposit RPC land here).
+                AddBuffer<InventorySlot>(entity);
                 // Server-only expiry tracker for timed buffs (paired with a StatModifier by SourceId; not replicated).
                 AddBuffer<TimedModifier>(entity);