diff --git a/CONTEXT.md b/CONTEXT.md
index 480e885..d2a0e6b 100644
--- a/CONTEXT.md
+++ b/CONTEXT.md
@@ -181,7 +181,7 @@ docs/
 15. **Server-Authoritative Replication** — All state mutations gated by `HasAuthority()`. Clients request via `Server_` RPCs; servers validate and replicate via `RepNotify`. See [`multiplayer-networking.md`](docs/architecture/multiplayer-networking.md).
 
 ## Build Order (Dependency-Safe)
-- **Phase 0:** Foundation + Input (01-core, 15-input — 8 systems)
+- **Phase 0:** Foundation + Input (01-core + 15-input — 9 systems — includes BPC_PlatformServiceAbstraction 150)
 - **Phase 1:** Player Core (02-player, 8 systems)
 - **Phase 2:** Interaction (03-interaction, 8 systems)
 - **Phase 3:** Inventory (04-inventory, 11 systems)
diff --git a/UE5_Modular_Game_Framework.md b/UE5_Modular_Game_Framework.md
index 0a1afae..5702412 100644
--- a/UE5_Modular_Game_Framework.md
+++ b/UE5_Modular_Game_Framework.md
@@ -4125,5 +4125,5 @@ Build these first. Everything else depends on them.
 *End of Reusable UE5 Modular Game Framework v2.0*
 *Framework designed for generic use. All system names are project-agnostic.*
 *Override in /Game/ folder. Never modify /Framework/ core assets.*
-*C++ source: 22 classes in Source/PG_Framework/ | BP specs: 149 numbered files + 2 supplementary in docs/blueprints/*
+*C++ source: 22 classes in Source/PG_Framework/ | BP specs: 150 numbered files + 2 supplementary in docs/blueprints/*
 *Companion docs: docs/checklists/ (build order, status), docs/developer/ (per-category references), docs/architecture/ (state management, audio, networking, animation, sound)*
diff --git a/docs/blueprints/01-core/150_BPC_PlatformServiceAbstraction.md b/docs/blueprints/01-core/150_BPC_PlatformServiceAbstraction.md
new file mode 100644
index 0000000..f47a3aa
--- /dev/null
+++ b/docs/blueprints/01-core/150_BPC_PlatformServiceAbstraction.md
@@ -0,0 +1,406 @@
+# 150 — Platform Service Abstraction (`BPC_PlatformServiceAbstraction`)
+
+> **Blueprint-Only Implementation** — UE 5.5–5.7 supports all platform detection and SDK routing from Blueprints via `UGameplayStatics::GetPlatformName()`, conditional compilation checks, and plugin API calls. This component is the **single source of truth** for platform identity, replacing the three fragmented detection systems that currently exist across the framework.
+
+---
+
+## Purpose
+Central platform authority attached to the Game Instance. Detects the platform once at startup and provides a unified `EPlatformFamily` enum that ALL subsystems query instead of detecting platform independently. Routes platform-specific SDK calls (achievement submission to Steam/PSN/Xbox Live/Nintendo, cloud saves, overlays, input device profiles). Returns stub/no-op implementations on unsupported platforms so game code never needs `#if PLATFORM_PS5` checks.
+
+## The Problem Being Solved
+
+Currently the framework has **three independent platform detection systems**, each calling `GetPlatformName()` separately:
+
+| System | Enum | Platform Families |
+|--------|------|-------------------|
+| `BPC_RenderPipelineManager` (149) | `EPlatformFamily` | PS5, PS4, Xbox_Series, Xbox_One, Switch, PC_High, PC_Low, SteamDeck |
+| `SS_EnhancedInputManager` (128) | `E_InputPlatform` | PC_KeyboardMouse, Xbox, PS5_DualSense |
+| `BPC_HapticsController` (148) | `EControllerPlatform` | PC_Generic, Xbox, PS5_DualSense, PS4_DualShock |
+
+These are **different enums with different values** and don't talk to each other. If you change platform in one system, nothing cascades.
+
+**After this component is integrated, all three systems query `BPC_PlatformServiceAbstraction.GetPlatformFamily()` instead of detecting platform themselves. The old enums are deprecated and mapped to `EPlatformFamily`.**
+
+## Dependencies
+- **Requires:** [`GI_GameFramework`](../01-core/04_GI_GameFramework.md) (attached as component), [`DA_GameTagRegistry`](../01-core/01_DA_GameTagRegistry.md) (platform tag validation)
+- **Required By:** [`BPC_RenderPipelineManager`](../12-settings/149_BPC_RenderPipelineManager.md) (GFX quality profile selection), [`SS_EnhancedInputManager`](../15-input/128_SS_EnhancedInputManager.md) (input device profile selection), [`BPC_HapticsController`](../12-settings/148_BPC_HapticsController.md) (controller platform detection), [`SS_AchievementSystem`](../11-meta/103_SS_AchievementSystem.md) (SDK routing), [`SS_SettingsSystem`](105_SS_SettingsSystem.md) (platform-aware defaults)
+- **Engine/Plugin Requirements:** GameplayTags, `UGameplayStatics`, Platform SDK plugins (Steamworks, PSN, Xbox GDK, Nintendo SDK — all optional)
+
+## Class Info
+| Property | Value |
+|----------|-------|
+| **Parent Class** | `ActorComponent` |
+| **Class Type** | Blueprint Component |
+| **Asset Path** | `Content/Framework/Core/BPC_PlatformServiceAbstraction` |
+| **Implements Interfaces** | None |
+| **Attachment** | Game Instance (`GI_GameFramework`) |
+
+---
+
+## 1. Enums
+
+### `EPlatformFamily` (UNIFIED — all systems use this)
+
+| Value | Description | Input Device | Render Pipeline | Achievements SDK | Store |
+|-------|-------------|-------------|-----------------|-----------------|-------|
+| `Unknown = 0` | Not yet detected | — | — | — | — |
+| `PC_Win64 = 1` | Windows PC (any GPU) | KB+M / Xbox / PS5 gamepad | Detected per GPU capability | Steam / EGS | Steam / EGS |
+| `PC_Linux = 2` | Linux / SteamOS | Same as PC | Vulkan | Steam | Steam |
+| `PS5 = 3` | PlayStation 5 | DualSense | Lumen + Nanite | PSN Trophies | PS Store |
+| `PS5_Pro = 4` | PlayStation 5 Pro | DualSense | Lumen + PSSR | PSN Trophies | PS Store |
+| `PS4 = 5` | PlayStation 4 / 4 Pro | DualShock 4 | Baked only | PSN Trophies | PS Store |
+| `Xbox_Series = 6` | Xbox Series X\|S | Xbox Wireless | Lumen + Nanite | Xbox Live | MS Store |
+| `Xbox_One = 7` | Xbox One / One X | Xbox Wireless | Baked only | Xbox Live | MS Store |
+| `Switch = 8` | Nintendo Switch | Joy-Con / Pro | Baked + Proxy | Nintendo | eShop |
+| `Switch_2 = 9` | Nintendo Switch 2 | Joy-Con 2 / Pro 2 | Baked + CSM + FSR | Nintendo | eShop |
+| `SteamDeck = 10` | Steam Deck | Built-in / external | Baked/SSGI + CSM | Steam | Steam |
+| `Mac = 11` | macOS | KB+M / gamepad | Metal / Baked | Steam | Steam / App Store |
+
+### `EPlatformSDK`
+| Value | Description |
+|-------|-------------|
+| `None = 0` | No SDK available (editor, generic build) |
+| `Steam = 1` | Steamworks SDK (achievements, cloud, overlay, stats) |
+| `PSN = 2` | PlayStation Network SDK (trophies, cloud, overlay, invites) |
+| `XboxLive = 3` | Xbox Live / GDK (achievements, cloud, overlay, invites) |
+| `Nintendo = 4` | Nintendo SDK (achievements, cloud, overlay) |
+| `EGS = 5` | Epic Games Store SDK |
+
+### `EPlatformOverlayType`
+| Value | Description |
+|-------|-------------|
+| `Achievements = 0` | Show platform achievements/trophies page |
+| `Friends = 1` | Open friends list |
+| `Invite = 2` | Send game invite |
+| `Store = 3` | Open store page (DLC, etc.) |
+| `SocialFeed = 4` | Community / social feed |
+
+---
+
+## 2. Structs
+
+### `SPlatformCapabilities`
+| Field | Type | Description |
+|-------|------|-------------|
+| `Platform` | `EPlatformFamily` | Current platform |
+| `SDK` | `EPlatformSDK` | Available platform SDK |
+| `bSupportsLumen` | `bool` | Platform GPU supports Lumen GI |
+| `bSupportsNanite` | `bool` | Platform GPU supports Nanite |
+| `bSupportsHWRT` | `bool` | Platform supports hardware ray tracing |
+| `bSupportsCloudSaves` | `bool` | Platform has cloud save API |
+| `bSupportsAchievements` | `bool` | Platform has achievement/trophy system |
+| `bSupportsOverlay` | `bool` | Platform has in-game overlay |
+| `bSupportsRichPresence` | `bool` | Platform supports rich presence / "now playing" |
+| `bSupportsUserGeneratedContent` | `bool` | Platform supports UGC/mod sharing |
+| `bIsConsole` | `bool` | Is this a console platform (certification required)? |
+| `bIsHandheld` | `bool` | Is this a handheld device? |
+| `DefaultInputType` | `FName` | Default input device for this platform ("Gamepad", "Keyboard", "Touch") |
+| `MaxLocalPlayers` | `int32` | Maximum local split-screen players |
+| `StoreID` | `FString` | Platform store ID for DLC checks |
+
+---
+
+## 3. Variables
+
+### Configuration (Instance Editable)
+| Variable | Type | Default | Category | Description |
+|----------|------|---------|----------|-------------|
+| `bAutoDetectPlatform` | `bool` | `true` | `Config` | Auto-detect on Initialize |
+| `OverridePlatform` | `EPlatformFamily` | `Unknown` | `Config` | Force a platform (for testing in editor) |
+| `bEnableSDKIntegration` | `bool` | `true` | `Config` | Enable platform SDK calls |
+
+### Internal (Private)
+| Variable | Type | Default | Category | Description |
+|----------|------|---------|----------|-------------|
+| `CurrentPlatform` | `EPlatformFamily` | `Unknown` | `State` | Detected or overridden platform |
+| `CurrentSDK` | `EPlatformSDK` | `None` | `State` | Active platform SDK |
+| `PlatformCapabilities` | `SPlatformCapabilities` | — | `State` | Full capabilities snapshot |
+| `bIsInitialized` | `bool` | `false` | `State` | Whether Initialize completed |
+| `CachedGameInstance` | `GI_GameFramework` | `None` | `Cache` | Owner Game Instance reference |
+
+---
+
+## 4. Functions
+
+### Public Functions
+
+#### `Initialize` → `void`
+- **Description:** Detect platform, resolve SDK, build capabilities, broadcast ready signal. Called once at Game Instance startup.
+- **Flow:**
+  1. Get Owner → Cast to `GI_GameFramework` → cache
+  2. If `OverridePlatform != Unknown`: use override
+  3. Else if `bAutoDetectPlatform`: call `DetectPlatform()`
+  4. Resolve which SDK is available: check plugin state, build configuration
+  5. Build `SPlatformCapabilities` for detected platform
+  6. Register platform in `DA_GameTagRegistry` as `Framework.Platform.{Name}`
+  7. Set `bIsInitialized = true`
+  8. Broadcast `OnPlatformReady(CurrentPlatform)`
+  9. Broadcast `OnPlatformCapabilitiesReady(PlatformCapabilities)`
+
+#### `DetectPlatform` → `EPlatformFamily`
+- **Description:** Detects the current platform using UE5 APIs.
+- **Flow:**
+  1. `UGameplayStatics::GetPlatformName()` → switch:
+     - "PS5" → check if Pro model available → `PS5_Pro` or `PS5`
+     - "PS4" → `PS4`
+     - "XboxOne" → `Xbox_One`
+     - "XSX" or "XboxAnaconda" → `Xbox_Series` (check if S model → adjust capabilities)
+     - "Switch" → check model revision → `Switch_2` or `Switch`
+     - "Win64" → check if running on Steam Deck (`IsSteamDeck()`) → `SteamDeck`
+     - "Win64" → `PC_Win64`
+     - "Linux" → `PC_Linux`
+     - "Mac" → `Mac`
+  2. Store in `CurrentPlatform`
+  3. Return `CurrentPlatform`
+
+#### `GetPlatformFamily` → `EPlatformFamily`
+- **Description:** Returns the current platform. **This is the function ALL other systems call.** Read-only, always available after initialization.
+
+#### `GetSDK` → `EPlatformSDK`
+- **Description:** Returns the available platform SDK. Used by achievement and save systems for routing.
+
+#### `GetPlatformCapabilities` → `SPlatformCapabilities`
+- **Description:** Returns the full capabilities struct. Read-only.
+
+#### `SubmitAchievementToPlatform` → `bool`
+- **Description:** Route an achievement unlock to the correct platform SDK.
+- **Parameters:**
+  | Param | Type | Description |
+  |-------|------|-------------|
+  | `AchievementID` | `FString` | Platform-specific achievement ID |
+- **Flow:**
+  1. Switch on `CurrentSDK`:
+     - `Steam` → call Steamworks `ISteamUserStats::SetAchievement(AchievementID)` + `StoreStats()`
+     - `PSN` → call PSN Trophy API `UnlockTrophy(AchievementID)`
+     - `XboxLive` → call Xbox Live `AchievementsService::UpdateAchievement(AchievementID, 100)`
+     - `Nintendo` → call Nintendo achievement API
+     - `None` → log "Achievement submitted (editor mode)" → return true (no-op stub)
+  2. Return true if successful, false on SDK error
+
+#### `SyncCloudSave` → `bool`
+- **Description:** Upload or sync save data to platform cloud.
+- **Parameters:**
+  | Param | Type | Description |
+  |-------|------|-------------|
+  | `SlotIndex` | `int32` | Which save slot |
+  | `SaveData` | `TArray<uint8>` | Serialized save data |
+- **Flow:** Route to Steam Cloud / PSN Cloud / Xbox Cloud / Nintendo Cloud based on `CurrentSDK`.
+
+#### `ShowPlatformOverlay` → `void`
+- **Description:** Open a platform-specific overlay.
+- **Parameters:**
+  | Param | Type | Description |
+  |-------|------|-------------|
+  | `OverlayType` | `EPlatformOverlayType` | Which overlay to show |
+- **Flow:**
+  1. Switch on `CurrentSDK`:
+     - `Steam` → `ISteamFriends::ActivateGameOverlay(URL)`
+     - `PSN` → System software overlay API
+     - Others → nop (not supported)
+
+#### `GetDefaultInputProfile` → `FName`
+- **Description:** Returns the default input profile for this platform. Used by `SS_EnhancedInputManager` to select the correct `DA_InputMappingProfile`.
+- **Returns:** "PC_KeyboardMouse", "Xbox", "PS5_DualSense", "PS4_DualShock", "Switch_JoyCon"
+
+#### `IsConsole` → `bool`, `IsHandheld` → `bool`, `IsPS5` → `bool`, `IsXbox` → `bool`, `IsSwitch` → `bool`, `IsPC` → `bool`, `IsSteamDeck` → `bool`
+- **Description:** Convenience boolean checks for common platform queries. All return from `PlatformCapabilities` struct.
+
+#### `GetConsoleCertificationRequirements` → `TArray<FText>`
+- **Description:** Returns a list of TRC (Technical Requirement Checklist) items for the current console platform. Empty on PC.
+- **Flow:**
+  1. Switch on `CurrentPlatform`:
+     - `PS5` → return Sony TRC items (60 FPS perf mode, HDR support, controller speaker, activity cards, etc.)
+     - `PS4` → return Sony PS4 TRC items
+     - `Xbox_Series` → return Microsoft XR items (Quick Resume, Smart Delivery, VRR, etc.)
+     - `Xbox_One` → return Microsoft XR items
+     - `Switch` → return Nintendo guidelines (dynamic resolution, Handheld/Docked parity, etc.)
+     - `PC_*` → return empty (no console cert needed)
+
+#### `GetStoreID` → `FString`
+- **Description:** Returns the platform store app ID for DLC entitlement checks.
+
+---
+
+## 5. Event Dispatchers
+
+| Dispatcher | Parameters | Bind Access | Description |
+|------------|-----------|-------------|-------------|
+| `OnPlatformReady` | `EPlatformFamily Platform` | `Public` | Fired after platform detection completes — all other systems bind to this for deferred init |
+| `OnPlatformCapabilitiesReady` | `SPlatformCapabilities Capabilities` | `Public` | Fired alongside OnPlatformReady with full capability info |
+| `OnPlatformSDKReady` | `EPlatformSDK SDK` | `Public` | Fired when platform SDK is ready for API calls |
+| `OnPlatformOverlayOpened` | `EPlatformOverlayType Type` | `Public` | Fired when platform overlay opens (game should pause) |
+| `OnPlatformOverlayClosed` | — | `Public` | Fired when platform overlay closes (game resumes) |
+| `OnCloudSaveCompleted` | `bool bSuccess`, `int32 SlotIndex` | `Public` | Fired when cloud save upload completes |
+| `OnAchievementSubmitted` | `FString AchievementID`, `bool bSuccess` | `Public` | Fired after platform API achievement call |
+
+---
+
+## 6. Overridden Events
+
+### Event: On Component Created (attached to GI_GameFramework via BeginPlay)
+- **Description:** Auto-initializes at game start.
+- **Flow:**
+  1. Call `Initialize()`
+  2. All dependent subsystems that bound to `OnPlatformReady` receive the event and complete their initialization
+
+---
+
+## 7. Blueprint Graph Logic Flow
+
+```mermaid
+flowchart TD
+    A[GI_GameFramework: BeginPlay] --> B[BPC_PlatformServiceAbstraction: Initialize]
+    B --> C{OverridePlatform?}
+    C -->|Yes| D[Use Override]
+    C -->|No| E[DetectPlatform]
+    E --> F[Switch on GetPlatformName]
+    F --> G[Set CurrentPlatform]
+    D --> G
+    
+    G --> H[Resolve available SDK]
+    H --> I[Build SPlatformCapabilities]
+    I --> J[Register Platform Tag in DA_GameTagRegistry]
+    J --> K[Broadcast OnPlatformReady]
+    
+    K --> L[ALL BOUND SYSTEMS RECEIVE]
+    L --> M[RenderPipelineManager: load DA_RPP for platform]
+    L --> N[EnhancedInputManager: load DA_InputMapping for platform]
+    L --> O[HapticsController: set EControllerPlatform from platform]
+    L --> P[AchievementSystem: route SDK via GetSDK]
+    L --> Q[SettingsSystem: load platform defaults]
+```
+
+---
+
+## 8. Communication Matrix
+
+| Who Talks | How | What Is Sent |
+|-----------|-----|-------------|
+| `GI_GameFramework` | `Owner` | Hosts this component |
+| `BPC_PlatformServiceAbstraction` | `Dispatcher` → ALL systems | `OnPlatformReady(Platform)` — every system's deferred init trigger |
+| `BPC_RenderPipelineManager` (149) | `Function Call` | `GetPlatformFamily()` → selects correct `DA_RenderPipelineProfile` |
+| `SS_EnhancedInputManager` (128) | `Function Call` | `GetDefaultInputProfile()` → selects correct `DA_InputMappingProfile` |
+| `BPC_HapticsController` (148) | `Function Call` | `GetPlatformFamily()` → maps to `EControllerPlatform` |
+| `SS_AchievementSystem` (103) | `Function Call` | `SubmitAchievementToPlatform(ID)` → routes to Steam/PSN/Xbox/Nintendo |
+| `SS_SaveManager` (35) | `Function Call` | `SyncCloudSave(Slot, Data)` → routes to platform cloud API |
+| `SS_SettingsSystem` (105) | `Function Call` | `GetPlatformFamily()` → sets platform-appropriate defaults |
+| `SS_UIManager` (44) | `Dispatcher` | `OnPlatformOverlayOpened/Closed` → pause/resume game |
+| `DA_GameTagRegistry` (01) | `Function Call` | Register `Framework.Platform.{Name}` tag |
+
+---
+
+## 9. Platform Enum Mapping (Deprecation of old enums)
+
+The old scattered platform enums are mapped to `EPlatformFamily` as follows:
+
+| Deprecated Enum | Old Value | EPlatformFamily |
+|----------------|-----------|-----------------|
+| `E_InputPlatform::PC_KeyboardMouse` | 0 | `PC_Win64` (or `PC_Linux`, `Mac`) |
+| `E_InputPlatform::Xbox` | 1 | `Xbox_Series` or `Xbox_One` (detected) |
+| `E_InputPlatform::PS5_DualSense` | 2 | `PS5` or `PS5_Pro` |
+| `EControllerPlatform::PC_Generic` | 1 | `PC_Win64` |
+| `EControllerPlatform::Xbox` | 2 | `Xbox_Series` or `Xbox_One` |
+| `EControllerPlatform::PS5_DualSense` | 3 | `PS5` |
+| `EControllerPlatform::PS4_DualShock` | 4 | `PS4` |
+
+All systems that previously used their own platform enum now call:
+```
+BPC_PlatformServiceAbstraction → GetPlatformFamily() → map to local enum internally
+```
+
+---
+
+## 10. Validation / Testing Checklist
+
+- [ ] `DetectPlatform` correctly identifies all 12 platform families
+- [ ] `OverridePlatform = PS4` → all systems use PS4 profiles (baked lighting, DualShock, PSN SDK)
+- [ ] `OverridePlatform = Switch` → all systems use Switch profiles (baked, NIS, Joy-Con, Nintendo SDK)
+- [ ] `OverridePlatform = PS5_Pro` → RenderPipelineManager enables PSSR upscaler
+- [ ] `GetDefaultInputProfile` returns correct input profile for each platform
+- [ ] `SubmitAchievementToPlatform` on Steam build successfully calls Steam API
+- [ ] `SubmitAchievementToPlatform` in Editor returns true (no-op stub, no crash)
+- [ ] `SyncCloudSave` routes to correct platform cloud API
+- [ ] `ShowPlatformOverlay(Achievements)` opens correct platform overlay
+- [ ] `OnPlatformReady` fires before any dependent system queries `GetPlatformFamily()`
+- [ ] Changing `OverridePlatform` at runtime (dev cheat) cascades to all bound systems
+- [ ] Edge case: No SDK available (editor, generic build) → all SDK calls return no-op stubs
+- [ ] Edge case: Platform SDK initialization fails → `CurrentSDK = None`, systems fallback gracefully
+- [ ] Edge case: Steam Deck detection in Desktop Mode → reported as `PC_Linux`, not `SteamDeck`
+- [ ] Edge case: Xbox Series S (Lockhart) vs Series X (Anaconda) → different capabilities for GPU
+
+---
+
+## 11. Manual Implementation Guide
+
+### 11.1 Class Setup
+1. Create Blueprint Class: parent `ActorComponent`, name `BPC_PlatformServiceAbstraction`
+2. Path: `Content/Framework/Core/`
+3. Attach to `GI_GameFramework` (or BP child of it)
+
+### 11.2 Key UE5 Nodes
+| Node | Where to Find | Used For |
+|------|---------------|----------|
+| `Get Platform Name` | Right-click → "Get Platform Name" | Primary detection API |
+| `Switch on String` | Right-click → "Switch" | Platform name branching |
+| `Is Steam Deck` | Custom node / check for "SteamDeck" in device name | Steam Deck detection |
+| `Is In Editor` | Right-click → "Is In Editor" | SDK substitution in editor |
+| `Switch on EPlatformFamily` | Right-click → "Switch" | Platform-specific logic |
+
+### 11.3 Node-by-Node: DetectPlatform
+
+```
+[Function: DetectPlatform]
+  Step 1: Get Platform Name → Store as PlatformStr
+  Step 2: Switch on String (PlatformStr):
+    "PS5" →
+      Step 2a: Get device model info → if "Pro" → PS5_Pro, else PS5
+    "PS4" → PS4
+    "XboxOne" → Xbox_One
+    "XSX" → Xbox_Series (check if "Lockhart" variant for Series S)
+    "XboxAnaconda" → Xbox_Series
+    "Switch" → Switch (check model revision for Switch_2)
+    "Win64" →
+      Step 2b: Check if running on Steam Deck → if yes → SteamDeck
+      Step 2c: Else → PC_Win64
+    "Linux" → PC_Linux
+    "Mac" → Mac
+    Default → PC_Win64 (fallback)
+  Step 3: Store result in CurrentPlatform
+  Step 4: Return CurrentPlatform
+```
+
+### 11.4 Networking
+- **Platform is per-client.** Each client may be on a different platform (PC host + PS5 client).
+- `BPC_PlatformServiceAbstraction` runs on ALL instances (server + each client).
+- Platform SDK calls are local-to-client.
+- For listen server: host's platform SDK is used for host's achievements; clients use their own.
+
+### 11.5 Multiplayer Note
+- In a multiplayer session, each player's platform is detected independently
+- Cross-platform play: a PC host may have Steam SDK active while a PS5 client has PSN SDK
+- The Game Instance's PlatformServiceAbstraction only represents the LOCAL player's platform
+- For dedicated servers: `CurrentPlatform = PC_Linux` or `PC_Win64`, `CurrentSDK = None` (no achievements on dedicated server)
+
+---
+
+## 12. Blueprint Build Checklist
+
+- [ ] Create Blueprint class: `BPC_PlatformServiceAbstraction` (parent: `ActorComponent`)
+- [ ] Add enums: `EPlatformFamily` (12 values), `EPlatformSDK` (6 values), `EPlatformOverlayType` (5 values)
+- [ ] Add struct: `SPlatformCapabilities`
+- [ ] Add all variables from Section 3
+- [ ] Build `Initialize` → `DetectPlatform` → `BuildCapabilities` → broadcast chain
+- [ ] Implement `DetectPlatform` with Switch on GetPlatformName
+- [ ] Implement `SubmitAchievementToPlatform` with Switch on CurrentSDK
+- [ ] Implement `SyncCloudSave`, `ShowPlatformOverlay`
+- [ ] Implement all boolean convenience functions (`IsConsole`, `IsPS5`, etc.)
+- [ ] Create all 7 event dispatchers
+- [ ] Wire OnPlatformReady as deferred init trigger for all dependent subsystems
+- [ ] Test: OverridePlatform = PS5 → OnPlatformReady fires with PS5
+- [ ] Test: Editor mode → SDK calls return no-op stubs
+- [ ] Test: Steam build → SubmitAchievement calls Steam API
+- [ ] Test: Platform hot-swap (dev cheat) cascades to all bound systems
+
+---
+
+*Blueprint Spec: Platform Service Abstraction. Conforms to TEMPLATE.md v2.0 — part of the UE5 Modular Game Framework, CORE layer.*
diff --git a/docs/blueprints/11-meta/103_SS_AchievementSystem.md b/docs/blueprints/11-meta/103_SS_AchievementSystem.md
index d3457b2..41aae39 100644
--- a/docs/blueprints/11-meta/103_SS_AchievementSystem.md
+++ b/docs/blueprints/11-meta/103_SS_AchievementSystem.md
@@ -12,8 +12,8 @@
 - **Requires:** [`BPC_PlayerMetricsTracker`](../02-player/15_BPC_PlayerMetricsTracker.md) — Player stats source
 - **Requires:** [`BPC_NarrativeStateSystem`](../07-narrative/38_BPC_NarrativeStateSystem.md) — Story progression
 - **Required By:** [`WBP_NotificationToast`](../06-ui/WBP_NotificationToast.md) — UI notification
-- **Required By:** [`BPC_PlatformServiceAbstraction`](../12-settings/BPC_PlatformServiceAbstraction.md) — Platform API submission
-- **Engine/Plugin Requirements:** GameplayTags
+- **Required By:** [`BPC_PlatformServiceAbstraction`](../01-core/150_BPC_PlatformServiceAbstraction.md) — Platform API routing (Steam/PSN/Xbox/Nintendo)
+- **Engine/Plugin Requirements:** GameplayTags, Platform SDK plugins (Steamworks, PSN, Xbox GDK, Nintendo SDK — all optional)
 
 ### Purpose
 Platform-agnostic achievement and trophy tracking system. Manages achievement definitions, progress tracking, unlock logic, and platform API submission. Supports hidden achievements, progress-based achievements, and cross-save achievement state persistence.
@@ -118,7 +118,7 @@ Platform-agnostic achievement and trophy tracking system. Manages achievement de
 | [`BPC_PlayerMetricsTracker`](../02-player/15_BPC_PlayerMetricsTracker.md) | Direct read | Stats for achievements |
 | [`BPC_NarrativeStateSystem`](../07-narrative/38_BPC_NarrativeStateSystem.md) | Direct read | Story achievements |
 | [`WBP_NotificationToast`](../06-ui/WBP_NotificationToast.md) | Create widget | Toast display |
-| [`BPC_PlatformServiceAbstraction`](../12-settings/BPC_PlatformServiceAbstraction.md) | Direct call | Platform submission |
+| [`BPC_PlatformServiceAbstraction`](../01-core/150_BPC_PlatformServiceAbstraction.md) | Direct call | Platform SDK routing (Steam/PSN/Xbox/Nintendo) |
 
 ---
 
diff --git a/docs/blueprints/12-settings/148_BPC_HapticsController.md b/docs/blueprints/12-settings/148_BPC_HapticsController.md
index b1cb1aa..d339d49 100644
--- a/docs/blueprints/12-settings/148_BPC_HapticsController.md
+++ b/docs/blueprints/12-settings/148_BPC_HapticsController.md
@@ -8,7 +8,7 @@
 Abstraction layer for all controller haptic feedback and force feedback effects. Gameplay systems trigger haptics by GameplayTag (e.g., `Haptic.Damage.Heavy`) rather than calling raw UE5 haptic APIs. This component handles platform detection (Xbox rumble vs PS5 DualSense adaptive triggers vs generic PC gamepad), respects accessibility settings (`BPC_AccessibilitySettings.bHapticsEnabled`), and manages effect priority/conflict resolution.
 
 ## Dependencies
-- **Requires:** [`DA_HapticProfile`](docs/blueprints/14-data-assets/121_DA_HapticProfile.md) (effect definitions), [`BPC_AccessibilitySettings`](docs/blueprints/12-settings/104_BPC_AccessibilitySettings.md) (master toggle), [`BPC_StateManager`](docs/blueprints/16-state/130_BPC_StateManager.md) (heart rate for heartbeat haptic)
+- **Requires:** [`DA_HapticProfile`](docs/blueprints/14-data-assets/121_DA_HapticProfile.md) (effect definitions), [`BPC_AccessibilitySettings`](docs/blueprints/12-settings/104_BPC_AccessibilitySettings.md) (master toggle), [`BPC_StateManager`](docs/blueprints/16-state/130_BPC_StateManager.md) (heart rate for heartbeat haptic), [`BPC_PlatformServiceAbstraction`](docs/blueprints/01-core/150_BPC_PlatformServiceAbstraction.md) (platform detection — replaces own platform enum)
 - **Required By:** `BPC_HealthSystem` (damage haptics), `BPC_FirearmSystem` (weapon fire kick), `BPC_MeleeSystem` (melee impact), `BPC_PhysicsDragSystem` (grab/release), `BPC_ScareEventSystem` (tension rumble), `BP_ItemPickup` (pickup pulse), `BPC_MovementStateSystem` (footstep rumble via GASP notifies)
 - **Engine/Plugin Requirements:** Enhanced Input Plugin (controller detection), PlayStation 5 Controller Plugin (DualSense adaptive triggers — optional, graceful fallback)
 
@@ -56,7 +56,7 @@ Abstraction layer for all controller haptic feedback and force feedback effects.
 | `Right = 1` | Right (high-frequency) motor only |
 | `Both = 2` | Both motors simultaneously |
 
-### `EControllerPlatform`
+### `EControllerPlatform` *(deprecated — use EPlatformFamily from BPC_PlatformServiceAbstraction. This enum is mapped internally from the unified platform enum.)*
 | Value | Description |
 |-------|-------------|
 | `Unknown = 0` | Platform not yet detected |
diff --git a/docs/blueprints/12-settings/149_BPC_RenderPipelineManager.md b/docs/blueprints/12-settings/149_BPC_RenderPipelineManager.md
index f50173b..4555c31 100644
--- a/docs/blueprints/12-settings/149_BPC_RenderPipelineManager.md
+++ b/docs/blueprints/12-settings/149_BPC_RenderPipelineManager.md
@@ -8,7 +8,7 @@
 Central authority for render pipeline configuration. Reads `DA_RenderPipelineProfile` Data Assets to determine the appropriate rendering method (Lumen vs Baked Lightmass), shadow system (VSM vs CSM), upscaler (DLSS/FSR/TSR/PSSR), and mesh strategy (Nanite vs LOD) for the current platform and quality preset. Applies settings via UE5 console variables, coordinates with `BPC_PerformanceScaler` for runtime quality tier adjustments, and broadcasts pipeline changes so dependent systems (Planar Capture, Audio, UI) can adapt.
 
 ## Dependencies
-- **Requires:** [`DA_RenderPipelineProfile`](../14-data-assets/DA_RenderPipelineProfile.md) (render configs), [`SS_SettingsSystem`](105_SS_SettingsSystem.md) (saved quality preferences), [`GI_GameFramework`](../01-core/04_GI_GameFramework.md) (game phase for pre-load apply)
+- **Requires:** [`DA_RenderPipelineProfile`](../14-data-assets/DA_RenderPipelineProfile.md) (render configs), [`BPC_PlatformServiceAbstraction`](../01-core/150_BPC_PlatformServiceAbstraction.md) (central platform detection), [`SS_SettingsSystem`](105_SS_SettingsSystem.md) (saved quality preferences), [`GI_GameFramework`](../01-core/04_GI_GameFramework.md) (game phase for pre-load apply)
 - **Required By:** [`BPC_PerformanceScaler`](../10-adaptive/91_BPC_PerformanceScaler.md) (delegates CVar application), [`SS_PlanarCaptureManager`](../17-capture/138_SS_PlanarCaptureManager.md) (capture quality cap on pipeline change), [`WBP_SettingsMenu`](../06-ui/57_WBP_SettingsMenu.md) (Video tab quality controls)
 - **Engine/Plugin Requirements:** DLSS Plugin (optional), FSR Plugin (optional), XeSS Plugin (optional), GameplayTags, Enhanced Input
 
@@ -25,7 +25,8 @@ Central authority for render pipeline configuration. Reads `DA_RenderPipelinePro
 
 ## 1. Enums
 
-*See [`DA_RenderPipelineProfile`](../14-data-assets/DA_RenderPipelineProfile.md) for: `ERenderPipelineMethod`, `EShadowMethod`, `EReflectionMethod`, `EUpscalerMethod`, `EMeshStrategy`, `EPlatformFamily`.*
+*See [`DA_RenderPipelineProfile`](../14-data-assets/DA_RenderPipelineProfile.md) for: `ERenderPipelineMethod`, `EShadowMethod`, `EReflectionMethod`, `EUpscalerMethod`, `EMeshStrategy`.*
+*See [`BPC_PlatformServiceAbstraction`](../01-core/150_BPC_PlatformServiceAbstraction.md) for: `EPlatformFamily` (unified — all systems use this).*
 
 ### `ERenderPipelineChangeType`
 | Value | Description |
@@ -41,7 +42,7 @@ Central authority for render pipeline configuration. Reads `DA_RenderPipelinePro
 ### `SActivePipelineState`
 | Field | Type | Description |
 |-------|------|-------------|
-| `Platform` | `EPlatformFamily` | Detected platform |
+| `Platform` | `EPlatformFamily` | Detected platform (from BPC_PlatformServiceAbstraction) |
 | `ActivePreset` | `FName` | Currently applied quality preset name |
 | `PendingPreset` | `FName` | Queued preset awaiting reload |
 | `ActivePipelineProfile` | `DA_RenderPipelineProfile` | Currently loaded profile Data Asset |
@@ -81,7 +82,8 @@ Central authority for render pipeline configuration. Reads `DA_RenderPipelinePro
 - **Description:** Detects platform, loads the appropriate `DA_RenderPipelineProfile`, reads saved quality from `SS_SettingsSystem`, and applies initial pipeline settings.
 - **Flow:**
   1. Get Owner → Cast to PlayerController → cache
-  2. If `bAutoDetectPlatform`: call `DetectPlatform()` → set `DetectedPlatform`
+  2. Bind to `GI_GameFramework.GetSubsystem(BPC_PlatformServiceAbstraction).OnPlatformReady`
+  3. In handler: read `PlatformService.GetPlatformFamily()` → set `DetectedPlatform`
   3. Lookup `DA_RenderPipelineProfile` from `PlatformProfileMap` by `DetectedPlatform`
   4. If not found: log error, fallback to `PC_High` profile
   5. Read `SS_SettingsSystem.GetSettingFloat("QualityPreset")` → resolve preset name
@@ -173,7 +175,7 @@ Central authority for render pipeline configuration. Reads `DA_RenderPipelinePro
   3. Call `ApplyRenderConfig(PendingPreset, Config)`
   4. Broadcast `OnRenderPipelineChanged(PendingPreset, RequiresLevelReload)`
 
-#### `DetectPlatform` → `EPlatformFamily`
+#### `DetectPlatform` → `EPlatformFamily` *(deprecated — use BPC_PlatformServiceAbstraction.GetPlatformFamily() instead)*
 - **Description:** Auto-detect the current platform and GPU capability.
 - **Flow:**
   1. Check `UGameplayStatics::GetPlatformName()`:
diff --git a/docs/blueprints/15-input/128_SS_EnhancedInputManager.md b/docs/blueprints/15-input/128_SS_EnhancedInputManager.md
index 3bd0ff1..17f4956 100644
--- a/docs/blueprints/15-input/128_SS_EnhancedInputManager.md
+++ b/docs/blueprints/15-input/128_SS_EnhancedInputManager.md
@@ -8,7 +8,7 @@
 Centralized Game Instance Subsystem that manages all UE5 Enhanced Input operations: Input Mapping Context push/pop with priority stack, platform-specific binding profiles, key rebinding, input mode coordination with [`SS_UIManager`](docs/blueprints/06-ui/44_SS_UIManager.md), and read-only input state queries for gameplay systems.
 
 ## Dependencies
-- **Requires:** [`DA_InputMappingProfile`](docs/blueprints/14-data-assets/129_DA_InputMappingProfile.md) (platform profiles), [`GI_GameFramework`](docs/blueprints/01-core/04_GI_GameFramework.md) (subsystem access)
+- **Requires:** [`DA_InputMappingProfile`](docs/blueprints/14-data-assets/129_DA_InputMappingProfile.md) (platform profiles), [`GI_GameFramework`](docs/blueprints/01-core/04_GI_GameFramework.md) (subsystem access), [`BPC_PlatformServiceAbstraction`](docs/blueprints/01-core/150_BPC_PlatformServiceAbstraction.md) (central platform detection — replaces own platform enum)
 - **Required By:** All gameplay systems that read input (`BPC_InteractionDetector`, `BPC_FirearmSystem`, `BPC_MovementStateSystem`, `BPC_CutsceneBridge`, `BPC_HidingSystem`, `BPC_ActiveItemSystem`, etc.)
 - **Engine/Plugin Requirements:** Enhanced Input Plugin (UE5 built-in), `UEnhancedInputLocalPlayerSubsystem`
 
@@ -33,12 +33,12 @@ Centralized Game Instance Subsystem that manages all UE5 Enhanced Input operatio
 | `Inspection = 3` | 3D item inspection (IMC_Inspection, Priority 20) |
 | `UI = 4` | Full-screen menus/pause (IMC_UI, Priority 100) |
 
-### `E_InputPlatform`
+### `E_InputPlatform` *(deprecated — use EPlatformFamily from BPC_PlatformServiceAbstraction. This enum is kept for DA_InputMappingProfile compatibility but all runtime selection uses the unified enum)*
 | Value | Description |
 |-------|-------------|
-| `PC_KeyboardMouse = 0` | Keyboard + Mouse |
-| `Xbox = 1` | Xbox Series X\|S / Xbox One |
-| `PS5_DualSense = 2` | PlayStation 5 DualSense |
+| `PC_KeyboardMouse = 0` | Keyboard + Mouse (maps to `PC_Win64`, `PC_Linux`, `Mac`) |
+| `Xbox = 1` | Xbox Series X\|S / Xbox One (maps to `Xbox_Series` or `Xbox_One`) |
+| `PS5_DualSense = 2` | PlayStation 5 DualSense (maps to `PS5` or `PS5_Pro`) |
 
 ---
 
@@ -290,6 +290,7 @@ flowchart TD
 | `BPC_HidingSystem` | `Function Call` | `SS_EnhancedInputManager::PushContext(Hiding) / PopContext(Hiding)` |
 | `BPC_ActiveItemSystem` | `Function Call` | `SS_EnhancedInputManager::IsActionPressed("IA_QuickSlot1")` |
 | `BPC_HapticsController` (148) | `Function Call` | `SS_EnhancedInputManager::GetControllerPlatform()` — for platform detection |
+| `BPC_PlatformServiceAbstraction` (150) | `Function Call / Bind OnPlatformReady` | `GetDefaultInputProfile()` — selects correct DA_InputMappingProfile for detected platform |
 | `WBP_PauseMenu` | `Function Call` | `SS_EnhancedInputManager::PushContext(UI) / PopContext(UI)` |
 | `WBP_InventoryMenu` | `Function Call` | `SS_EnhancedInputManager::PushContext(WristwatchUI)` |
 | `BP_PuzzleDeviceActor` | `Function Call` | `SS_EnhancedInputManager::PushContext(Inspection)` |
diff --git a/docs/blueprints/AUDIT_REPORT.md b/docs/blueprints/AUDIT_REPORT.md
index bf4e39a..03b92eb 100644
--- a/docs/blueprints/AUDIT_REPORT.md
+++ b/docs/blueprints/AUDIT_REPORT.md
@@ -117,7 +117,7 @@ These systems appear in the Plan but may need explicit spec files or are covered
 - `BPC_HapticsController` — ✅ Created (system 148); `docs/blueprints/12-settings/148_BPC_HapticsController.md`
 - `BPC_RenderPipelineManager` — ✅ Created (system 149); `docs/blueprints/12-settings/149_BPC_RenderPipelineManager.md`
 - `DA_RenderPipelineProfile` — ✅ Created (supplementary); `docs/blueprints/14-data-assets/DA_RenderPipelineProfile.md`
-- `BPC_PlatformServiceAbstraction` — Not yet created; Master Section 12.3
+- `BPC_PlatformServiceAbstraction` — ✅ Created (system 150); `docs/blueprints/01-core/150_BPC_PlatformServiceAbstraction.md`
 
 ---
 
diff --git a/docs/blueprints/INDEX.md b/docs/blueprints/INDEX.md
index f5e2b95..17514b5 100644
--- a/docs/blueprints/INDEX.md
+++ b/docs/blueprints/INDEX.md
@@ -1,6 +1,6 @@
 # Master Blueprint Index — UE5 Modular Game Framework
 
-**Version:** 3.6 | **Generated:** 2026-05-22 | **Total Files:** 149 numbered + 1 starter + 2 supplementary (152 total specs) | **C++:** 27 source files (15 full + 10 stubs + 2 utility)
+**Version:** 3.7 | **Generated:** 2026-05-22 | **Total Files:** 150 numbered + 1 starter + 2 supplementary (153 total specs) | **C++:** 27 source files (15 full + 10 stubs + 2 utility)
 
 This document is the canonical index of every Blueprint specification file in the framework. Each entry links to its full spec document and includes: file name, asset type, parent class, purpose summary, and key dependencies.
 
@@ -25,7 +25,7 @@ docs/blueprints/
 │
 ├── 00-project-setup/                 ← Project Setup & Starter Assets (1 file)
 │   └── GI_StarterGameInstance.md     ← Minimal GameInstance; tag validation entry point
-├── 01-core/                          ← Foundation (7 files + 11 Data Table CSVs + 1 Macro Library)
+├── 01-core/                          ← Foundation (8 files + 11 Data Table CSVs + 1 Macro Library)
 │   ├── data-tables/                  ← Per-category Gameplay Tag Data Tables (NEW — replaces DT_ProjectTags.csv)
 │   │   ├── DT_Tags_Player.csv        (34 tags)
 │   │   ├── DT_Tags_Interaction.csv   (36 tags)
@@ -72,6 +72,7 @@ docs/blueprints/
 | 05 | [`05_GM_CoreGameMode`](01-core/05_GM_CoreGameMode.md) | `GM_` Game Mode | `GameModeBase` | Core game mode; spawns player, sets default classes, pause control | 01-core |
 | 06 | [`06_GS_CoreGameState`](01-core/06_GS_CoreGameState.md) | `GS_` Game State | `GameStateBase` | Shared game state; tracks global flags, phase, timer | 01-core |
 | 07 | [`07_DA_ItemData`](01-core/07_DA_ItemData.md) | `DA_` Data Asset | `PrimaryDataAsset` | Base item data asset; inherited by all item types | 01-core |
+| 150 | [`150_BPC_PlatformServiceAbstraction`](01-core/150_BPC_PlatformServiceAbstraction.md) | `BPC_` Component | `ActorComponent` | Central platform authority; unified platform detection, SDK routing, achievement/cloud/overlay | 01-core |
 | — | — | — | — | — | — |
 | 08 | [`08_BPC_HealthSystem`](02-player/08_BPC_HealthSystem.md) | `BPC_` Component | `ActorComponent` | Player health, damage resistance, death trigger, healing | 02-player |
 | 09 | [`09_BPC_StaminaSystem`](02-player/09_BPC_StaminaSystem.md) | `BPC_` Component | `ActorComponent` | Stamina pool, sprint/action drain, exhaustion states, regen | 02-player |
@@ -237,7 +238,7 @@ docs/blueprints/
 
 | Prefix | Type | Count |
 |--------|------|-------|
-| `BPC_` | Blueprint Component | 82 |
+| `BPC_` | Blueprint Component | 83 |
 | `BP_` | Blueprint Actor | 11 |
 | `WBP_` | Widget Blueprint | 14 |
 | `DA_` | Data Asset | 20 |
@@ -250,7 +251,7 @@ docs/blueprints/
 | `AI_` | AI Controller | 1 |
 | `BB_` | Blackboard | 1 |
 | `E_` | Enum | 5 |
-| **Total** | | **161** |
+| **Total** | | **162** |
 
 ---
 
@@ -268,7 +269,8 @@ Below are the most cross-referenced systems — these are the ones the State Man
 | `BPC_StateManager` (130) | EVERY system (central query point) |
 | `SS_AudioManager` (132) | ALL systems that play audio, BP_RoomAudioZone, WBP_SettingsMenu, BPC_StateManager (heart rate → audio) |
 | `BPC_HapticsController` (148) | HealthSystem, FirearmSystem, MeleeSystem, ScareEventSystem, PhysicsDrag, MovementState, ReloadSystem, DeathHandling, Staminasystem, StateManager → heartbeat, AccessibilitySettings |
-| `BPC_RenderPipelineManager` (149) | PerformanceScaler (delegates CVars), SettingsSystem (quality persistence), PlanarCaptureManager (budget adjustment), SettingsMenu (upscaler query), AtmosphereController |
+| `BPC_RenderPipelineManager` (149) | PerformanceScaler (delegates CVars), SettingsSystem (quality persistence), PlanarCaptureManager (budget adjustment), SettingsMenu (upscaler query), PlatformServiceAbstraction (platform detection) |
+| `BPC_PlatformServiceAbstraction` (150) | ALL systems (central platform query), RenderPipelineManager, EnhancedInputManager, HapticsController, AchievementSystem, SaveManager, SettingsSystem, UIManager |
 | `ABP_GASP` (external) | StateManager (overlay + action intensity), MovementState, Hiding, Stamina, Embodiment |
 
 ---
@@ -331,7 +333,7 @@ Below are the most cross-referenced systems — these are the ones the State Man
 
 ---
 
-*Master Blueprint Index v3.6 — The single reference document for every file in the framework. Now 149 files + 2 supplementary with State Management, MetaSounds Audio, Multiplayer Networking, Planar Capture System, Haptics Controller, and Render Pipeline Manager support.*
+*Master Blueprint Index v3.7 — The single reference document for every file in the framework. Now 150 files + 2 supplementary with unified platform authority (PlatformServiceAbstraction), State Management, MetaSounds Audio, Multiplayer Networking, Planar Capture System, Haptics Controller, and Render Pipeline Manager support.*
 
 ---
 
diff --git a/docs/checklists/cpp-blueprint-status.md b/docs/checklists/cpp-blueprint-status.md
index f2cb95e..fe3c889 100644
--- a/docs/checklists/cpp-blueprint-status.md
+++ b/docs/checklists/cpp-blueprint-status.md
@@ -183,6 +183,7 @@ Abbreviations:
 | 102-114 | All 13 systems | 🔵 | ✅ | BP children + widget BPs |
 | 148 | `BPC_HapticsController` | 🔵 (Blueprint-only) | ✅ | ⬜ BP child attach to PlayerController |
 | 149 | `BPC_RenderPipelineManager` | 🔵 (Blueprint-only) | ✅ | ⬜ BP child attach to PlayerController |
+| 150 | `BPC_PlatformServiceAbstraction` | 🔵 (Blueprint-only) | ✅ | ⬜ BP child attach to GI_GameFramework |
 
 ### Data Assets (14-data-assets — 16 systems)
 
diff --git a/docs/checklists/remaining-blueprint-build-order.md b/docs/checklists/remaining-blueprint-build-order.md
index 8abd4ea..98c620f 100644
--- a/docs/checklists/remaining-blueprint-build-order.md
+++ b/docs/checklists/remaining-blueprint-build-order.md
@@ -726,6 +726,7 @@ All 16 are Data Asset definitions. No code — create Data Asset instances per c
 | 105 | `SS_SettingsSystem` | BP child of GameInstanceSubsystem | Settings persistence: save/load config to disk, apply on boot |
 | 148 | `BPC_HapticsController` | BP child of ActorComponent | Haptics: GameplayTag-driven force feedback, DualSense triggers, heartbeat pulse |
 | 149 | `BPC_RenderPipelineManager` | BP child of ActorComponent | Render pipeline: quality presets, GI/shadows/upscaling per platform, PlanarCapture aware |
+| 150 | `BPC_PlatformServiceAbstraction` | BP child of ActorComponent | Central platform authority: detection, SDK routing (Steam/PSN/Xbox/Nintendo), input/GFX/achievement coordination |
 
 ---
 
diff --git a/docs/developer/INDEX.md b/docs/developer/INDEX.md
index bee883c..05b29b3 100644
--- a/docs/developer/INDEX.md
+++ b/docs/developer/INDEX.md
@@ -1,6 +1,6 @@
 # Developer Reference — UE5 Modular Game Framework
 
-**Version:** 1.8 | **Generated:** 2026-05-22 | **Files:** 21 (1 index + 3 overview + 1 migration + 1 integration + 1 prototype + 1 starter + 10 category docs + 1 combined + 1 capture + 1 render) | **C++:** 15 full + 10 stubs = 25 systems
+**Version:** 1.9 | **Generated:** 2026-05-22 | **Files:** 21 | **Systems:** 150 numbered + 2 supplementary
 
 This directory contains developer-facing reference documentation for every system in the framework. Unlike the blueprint spec files (which define *what* to build), these documents explain *how each system works internally* — the data flow, state machines, integration points, and design rationale. Use these when you need to understand a system's behavior to implement, debug, or extend it.
 
@@ -52,6 +52,7 @@ docs/developer/
 | 05 | `GM_CoreGameMode` | Foundation | Spawns player, manages game rules |
 | 06 | `GS_CoreGameState` | Foundation | Shared game state, phase tracker |
 | 07 | `DA_ItemData` | Foundation | Base item data asset |
+| 150 | `BPC_PlatformServiceAbstraction` | Foundation | Central platform authority — detection, SDK routing, input/GFX/achievement coordination (NEW) |
 | 08 | `BPC_HealthSystem` | Player | Health, damage, death trigger |
 | 09 | `BPC_StaminaSystem` | Player | Stamina pool, sprint drain, exhaustion |
 | 10 | `BPC_StressSystem` | Player | Psychological stress tiers, hallucinations |