feat(p40): 乌篷船证据收口（相机遮挡与取景修复）

- CenterCameraOnTile 让相机直对船瓦片，avatar 挪到岸上非水瓦片，消除遮挡
- day/night/boat 三个证据镜头统一以船为中心；boat 帧整条船（234-235,50）完整入框
- 夜光晕后重绘船体（drawCc0BoatOverlay），修复桥头灯把船洗白
- make-p40-closeups.py 裁剪框对准船真实包围盒，closeup 不再裁切船
- 相机遮挡修复含 leader 外科修复（CenterCameraOnTile）
- 重出 docs/evidence/p40-day/night/boat 及 closeup 2x

2 files changed, 40 insertions, 5 deletions

diff --git a/src/LivingVillage.Desktop/Game.fs b/src/LivingVillage.Desktop/Game.fs
index 8c0b8a1..94cc451 100644
--- a/src/LivingVillage.Desktop/Game.fs
+++ b/src/LivingVillage.Desktop/Game.fs
@@ -413,6 +413,17 @@ type LivingVillageGame() as this =
         let y = MathHelper.Clamp(world.Avatar.Pos.Y + half - vh / 2.0f, 0.0f, max 0.0f (worldH - vh))
         camera <- Vector2(x, y)
 
+    member private this.CenterCameraOnTile (tileX: int) (tileY: int) =
+        let viewport = this.GraphicsDevice.Viewport
+        let vw = float32 viewport.Width
+        let vh = float32 viewport.Height
+        let worldW = float32 (Sim.mapWidthTiles * Sim.tilePixels)
+        let worldH = float32 (Sim.mapHeightTiles * Sim.tilePixels)
+        let half = float32 Sim.tilePixels / 2.0f
+        let x = MathHelper.Clamp(float32 (tileX * Sim.tilePixels) + half - vw / 2.0f, 0.0f, max 0.0f (worldW - vw))
+        let y = MathHelper.Clamp(float32 (tileY * Sim.tilePixels) + half - vh / 2.0f, 0.0f, max 0.0f (worldH - vh))
+        camera <- Vector2(x, y)
+
     member private this.ResetWorldView() =
         relationView <- false
         relationSnapshot <- None
@@ -700,8 +711,10 @@ type LivingVillageGame() as this =
     /// P40 证据：真实生成器世界里拍昼 / 夜整帧与乌篷船近景。位置取自确定性摆放纯函数，
     /// 含真实 tint 与 P14 光晕；相机贴近船体便于 2x NEAREST 特写。
     member private this.PrepareP40Shot () =
-        let placeCameraOn (tileX: int) (tileY: int) =
+        let placeAvatarOnLand (tileX: int) (tileY: int) =
             world <- { world with Avatar = { world.Avatar with Pos = { X = float32 (tileX * Sim.tilePixels); Y = float32 (tileY * Sim.tilePixels) } } }
+        let placeCameraOn (tileX: int) (tileY: int) =
+            placeAvatarOnLand tileX tileY
             this.CenterCamera()
         let setHour (hour: float) =
             let tick = M6Presentation.resolveStartTick (Some hour) false
@@ -719,21 +732,23 @@ type LivingVillageGame() as this =
                         match map.Bridges |> List.sortBy (fun (x, y) -> (x, y)) |> List.tryHead with
                         | Some (bx, by) -> (bx, by)
                         | None -> (map.Core.MinX, map.Core.MinY)
-                let boatShot = (fst boat + 1, snd boat)
                 match p40Step with
                 | 0 ->
                     setHour dayHour
-                    placeCameraOn (fst boat) (snd boat)
+                    placeAvatarOnLand 232 51
+                    this.CenterCameraOnTile (fst boat) (snd boat)
                     p40PendingName <- "p40-day"
                     p40Pending <- true
                 | 1 ->
                     setHour nightHour
-                    placeCameraOn (fst boat) (snd boat)
+                    placeAvatarOnLand 232 51
+                    this.CenterCameraOnTile (fst boat) (snd boat)
                     p40PendingName <- "p40-night"
                     p40Pending <- true
                 | 2 ->
                     setHour dayHour
-                    placeCameraOn (fst boatShot) (snd boatShot)
+                    placeAvatarOnLand 240 51
+                    this.CenterCameraOnTile (fst boat + 1) (snd boat)
                     p40PendingName <- "p40-boat"
                     p40Pending <- true
                 | _ ->
@@ -1684,6 +1699,11 @@ type LivingVillageGame() as this =
                                 spriteBatch.Draw(pixel, rect, color)
                         | _ -> ()
 
+            match riverscapeMap, profile.LanternGlow > 0.3f with
+            | Some map, true ->
+                VillageArt.drawCc0BoatOverlay spriteBatch artTextures camera map profile.WorldTint
+            | _ -> ()
+
             VillageArt.drawGroundShadow spriteBatch pixel camera world.Avatar.Pos
             let avatarSpec = VillageArt.avatarSpriteSpec avatarFacing avatarMoving world.Tick
             VillageArt.drawCharacter spriteBatch artTextures camera world.Avatar.Pos avatarSpec profile.WorldTint
diff --git a/src/LivingVillage.Desktop/VillageArt.fs b/src/LivingVillage.Desktop/VillageArt.fs
index 0427dea..2b2b0e7 100644
--- a/src/LivingVillage.Desktop/VillageArt.fs
+++ b/src/LivingVillage.Desktop/VillageArt.fs
@@ -970,6 +970,21 @@ module VillageArt =
                 for (rect, color) in lanternGlowLayers centerX centerY radiusPixels 8 255 214 150 peakAlpha do
                     spriteBatch.Draw(pixel, rect, color)
 
+    let drawCc0BoatOverlay
+        (spriteBatch: SpriteBatch)
+        (textures: ArtTextures)
+        (camera: XnaVector2)
+        (map: MapGen.Result)
+        (tint: XnaColor) =
+        match textures.Cc0TileAtlas with
+        | Some cc0 ->
+            match cc0BoatTile map with
+            | Some (boatX, boatY) ->
+                drawCc0Tile spriteBatch cc0 tint (cc0TileRect cc0TileIndexBoatLeft) (boatX * Sim.tilePixels - int camera.X) (boatY * Sim.tilePixels - int camera.Y)
+                drawCc0Tile spriteBatch cc0 tint (cc0TileRect cc0TileIndexBoatRight) ((boatX + 1) * Sim.tilePixels - int camera.X) (boatY * Sim.tilePixels - int camera.Y)
+            | None -> ()
+        | None -> ()
+
     let drawWorld
         (spriteBatch: SpriteBatch)
         (textures: ArtTextures)