chore: retarget server to .NET 10 and update stack docs

- NeonSprawl.Server: net8.0 -> net10.0
- README, tech_stack, server README, vision plan: .NET 8 -> .NET 10

Made-with: Cursor

README.md

@@ -7,7 +7,7 @@
 | Area | Choice |
 |------|--------|
 | Client | **Godot 4.x** (GDScript) |
-| Game server | **C# / .NET 8** (ASP.NET Core), **PostgreSQL**, **Protobuf** (JSON OK for earliest spike) |
+| Game server | **C# / .NET 10** (ASP.NET Core), **PostgreSQL**, **Protobuf** (JSON OK for earliest spike) |
 | Content | **JSON/YAML** + **JSON Schema** in CI |
 
 Full rationale and constraints: [`docs/architecture/tech_stack.md`](docs/architecture/tech_stack.md).

docs/architecture/tech_stack.md

@@ -4,7 +4,7 @@
 
 **Constraints from product vision:** Solo operator, server-authoritative critical paths, fixed isometric 3D client, tab-target combat, data-driven skills/items/recipes/quests, optional PvP zones, eventual scale-out (not day one).
 
-**Server runtime (locked):** **C# / .NET 8** — primary author has ~10 years C# experience; authoritative game logic, persistence, and ops stay in this stack.
+**Server runtime (locked):** **C# / .NET 10** — primary author has ~10 years C# experience; authoritative game logic, persistence, and ops stay in this stack.
 
 **Client scripting (locked):** **GDScript** in Godot—fast iteration, native engine integration; server remains the only **C#** game-logic surface.
 
@@ -15,7 +15,7 @@
 | Layer | Choice | Role |
 |--------|--------|------|
 | Game client | **Godot 4.x** + **GDScript** | Rendering, input, camera, local prediction (if any), UI, telemetry emit |
-| Game server | **C# / .NET 8** (ASP.NET Core) | Authoritative simulation, zones, combat/crafting resolution, persistence boundaries |
+| Game server | **C# / .NET 10** (ASP.NET Core) | Authoritative simulation, zones, combat/crafting resolution, persistence boundaries |
 | RPC / messages | **Protobuf** (or **JSON** for earliest spike only) | Versioned contracts between client and server |
 | Primary database | **PostgreSQL** | Characters, inventory, progression, economy ledger, idempotent transactions |
 | Cache / presence (when needed) | **Redis** | Sessions, rate limits, hot read models—**defer** until second scaling pain |
@@ -44,7 +44,7 @@
 
 - **Unreal** for this phase unless art direction *requires* it.
 
-## Server: C# (.NET 8)
+## Server: C# (.NET 10)
 
 **Why**
 

neon_sprawl_vision.plan.md

@@ -118,7 +118,7 @@ These decisions heavily affect architecture and content pipelines and should be
 **Decision record:** [`docs/architecture/tech_stack.md`](docs/architecture/tech_stack.md)
 
 - **Client:** Godot 4.x — isometric 3D presentation, intents to server, no client-authoritative economy or combat outcomes.
-- **Game server:** **C# / .NET 8** (ASP.NET Core)—authoritative simulation, PostgreSQL, Protobuf (JSON acceptable for earliest spike). Locked: operator primary language for backend.
+- **Game server:** **C# / .NET 10** (ASP.NET Core)—authoritative simulation, PostgreSQL, Protobuf (JSON acceptable for earliest spike). Locked: operator primary language for backend.
 - **Content:** JSON/YAML + schema validation in CI; shared definitions drive skills, items, recipes, quests.
 - **Plan B:** Unity client if the art pipeline warrants it; **server remains C#** for continuity.
 

server/NeonSprawl.Server/NeonSprawl.Server.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net10.0</TargetFramework>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
     <RootNamespace>NeonSprawl.Server</RootNamespace>

server/README.md

@@ -1,6 +1,6 @@
 # Game server (`NeonSprawl.Server`)
 
-ASP.NET Core **.NET 8** host for authoritative simulation (prototype: HTTP + health only).
+ASP.NET Core **.NET 10** host for authoritative simulation (prototype: HTTP + health only).
 
 ## Run