Refactor GameplayTag documentation and implementation

- Updated references from GI_GameTagRegistry to DA_GameTagRegistry in architecture overview and implementation patterns documentation.
- Added new Blueprint specification for GI_StarterGameInstance, detailing its purpose, configuration, and integration pattern.
- Introduced DA_GameTagRegistry Blueprint specification, centralizing GameplayTag management and providing functions for tag validation and logging.
- Created documentation for the Starter GameInstance, outlining its role in the project setup and how other systems can integrate with it.

docs/architecture/blueprint-limitations-workarounds.md

@@ -12,7 +12,7 @@ This document catalogs all UE5 engine functions that are C++ only (not exposed t
 
 **Engine Function:** `UGameplayTagsManager::Get().RequestAllGameplayTags()`  
 **UE5 Node:** Does NOT exist in Blueprint  
-**Files Affected:** `01_GI_GameTagRegistry.md`, any system that needs to enumerate all tags
+**Files Affected:** `01_DA_GameTagRegistry.md`, any system that needs to enumerate all tags
 
 **Blueprint Workaround — Data Table Proxy (Multi-Table):**
 
@@ -72,7 +72,7 @@ OR create a Blueprint Macro Library with a macro that wraps the subsystem lookup
 ### 3.1 `OnAssetLoaded` / `BeginPlay` on Data Assets (Not Available)
 
 **Engine Behavior:** `UPrimaryDataAsset` does not have `BeginPlay`, `Tick`, or event graphs. It's a pure data container.  
-**Files Affected:** `01_GI_GameTagRegistry.md`, all DA_* specs
+**Files Affected:** `01_DA_GameTagRegistry.md`, all DA_* specs
 
 **Blueprint Workaround:** Move initialization and validation logic to an owning system:
 

docs/architecture/bpc-statemanager.md

@@ -452,7 +452,7 @@ HasActionFlag(Tag: GameplayTag) → Boolean
 4. Populate default `GatingRules` from `DA_StateGatingTable` if assigned
 5. Bind to `GI_GameFramework.OnGamePhaseChanged` (for game-phase-gated rules)
 6. Bind to `BPC_HealthSystem.OnDeath` (auto-call `ForceStateChange(Dead)`)
-7. Register with `GI_GameTagRegistry` for tag-based queries
+7. Register with `DA_GameTagRegistry` for tag-based queries
 8. Bind to `BPC_HealthSystem.OnHealthChanged` → call `EvaluateInjuryState()`
 9. Bind to `BPC_StressSystem.OnStressTierChanged` → recalculate heart rate
 10. Bind to `BPC_StaminaSystem.OnExhaustionStateChanged` → recalculate heart rate

docs/architecture/multiplayer-networking.md

@@ -88,7 +88,7 @@ This means UI widgets, audio, and effects need **zero changes** for multiplayer
 | `GI_GameFramework` | Server sets GamePhase; clients read | Dispatchers broadcast to all |
 | `GM_CoreGameMode` | Server-only; spawns players, routes death | Extends replicated GameMode |
 | `GS_CoreGameState` | Server sets all state | **Full replication** — 5 vars with OnRep |
-| `GI_GameTagRegistry` | Read-only on all | Identical on all clients (ini-based) |
+| `DA_GameTagRegistry` | Read-only on all | Identical on all clients (ini-based) |
 | `FL_GameUtilities` | Static; no state | No replication needed |
 | `I_InterfaceLibrary` | Contracts; no state | No replication needed |
 | `DA_ItemData` | Read-only config | Identical on all clients |