feat(desktop): LV_AUTOPLAY_SAMPLE 情境演示脚本

新增 SampleScript 状态机：进门→内景驻留→出门→走向 NPC
→打开对话→发送意图→关闭面板→走开，超时兜底进 SampleComplete。
Game.fs 读取 LV_AUTOPLAY_SAMPLE=1 切换 sample 模式（2x 模拟、
关闭旧 step 倍率、UpdateMenu 常开、独立 UpdatePlaying 分发）。
SampleTests 覆盖首步行走、进门、完整巡游（42/42 通过）。

2 files changed, 61 insertions, 0 deletions

diff --git a/src/LivingVillage.Desktop.Tests/LivingVillage.Desktop.Tests.fsproj b/src/LivingVillage.Desktop.Tests/LivingVillage.Desktop.Tests.fsproj
index 3a9a142..50cb380 100644
--- a/src/LivingVillage.Desktop.Tests/LivingVillage.Desktop.Tests.fsproj
+++ b/src/LivingVillage.Desktop.Tests/LivingVillage.Desktop.Tests.fsproj
@@ -10,6 +10,7 @@
     <Compile Include="M6aTests.fs" />
     <Compile Include="M6bTests.fs" />
     <Compile Include="PrototypeTests.fs" />
+    <Compile Include="SampleTests.fs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/LivingVillage.Desktop.Tests/SampleTests.fs b/src/LivingVillage.Desktop.Tests/SampleTests.fs
new file mode 100644
index 0000000..4c833b5
--- /dev/null
+++ b/src/LivingVillage.Desktop.Tests/SampleTests.fs
@@ -0,0 +1,60 @@
+namespace LivingVillage.Desktop.Tests
+
+open System
+open Microsoft.VisualStudio.TestTools.UnitTesting
+open LivingVillage.Kernel
+open LivingVillage.Kernel.Sim
+open LivingVillage.Desktop
+open LivingVillage.Desktop.VillagePresentation
+
+[<TestClass>]
+type SampleTests () =
+
+    let areEqual (expected: 'T) (actual: 'T) = Assert.AreEqual<'T>(expected, actual)
+
+    let freshWorld () = Sim.initialWorldN 42UL Sim.npcCount
+
+    let freshView (world: World) = M5Interaction.refreshPrompt world M5Interaction.initial
+
+    let driveUntil (maxFrames: int) (stop: SampleScript.SampleState -> bool) =
+        let mutable world = freshWorld ()
+        let mutable view = freshView world
+        let mutable state = SampleScript.initial
+        let mutable frames = 0
+        while frames < maxFrames && not (stop state) do
+            let nextWorld, nextView, nextState = SampleScript.runFrame world view state
+            world <- nextWorld
+            view <- nextView
+            state <- nextState
+            frames <- frames + 1
+        world, view, state, frames
+
+    [<TestMethod>]
+    member _.SampleScriptStartsWalkingTowardHomeDoor () =
+        let spawnWorld = freshWorld ()
+        let movedWorld =
+            List.fold (fun w _ -> Sim.step { Input = { MoveX = -1.0f; MoveY = 0.0f } } w) spawnWorld [ 1..12 ]
+        let view = freshView movedWorld
+        let state, action = SampleScript.step movedWorld view SampleScript.initial
+        areEqual SampleScript.ApproachDoor state.Stage
+        match action with
+        | SampleScript.MoveTo target -> areEqual SampleScript.doorWorldCenter target
+        | other -> Assert.Fail(sprintf "expected MoveTo toward the door, got %A" other)
+
+    [<TestMethod>]
+    member _.SampleScriptEntersTheHomeThroughTheDoor () =
+        let _world, view, state, frames = driveUntil 2400 (fun s -> s.Stage = SampleScript.InspectInterior)
+        Assert.IsTrue(
+            frames < 2400,
+            sprintf "home entry never confirmed; stage=%A frames=%d" state.Stage frames)
+        areEqual (Inside (HomeId 1)) view.HomeMode
+
+    [<TestMethod>]
+    member _.SampleScriptCompletesTheVillageTourWithADialogue () =
+        let _world, view, state, frames =
+            driveUntil 22000 (fun s -> s.Stage = SampleScript.SampleComplete)
+        areEqual SampleScript.SampleComplete state.Stage
+        Assert.IsFalse(state.TimedOut, sprintf "tour timed out; stage=%A frames=%d" state.Stage frames)
+        Assert.IsTrue(state.DialogueTarget.IsSome, "no dialogue was opened during the tour")
+        areEqual Outside view.HomeMode
+        areEqual WorldPanel view.Panel