Turrets: 40 Ore + per-base cap of 6 + fit-one-cell textured model (fix cheap/spam/massive/untextured)

Operator: turrets were "super duper cheap", spammable "unlimited", "spaced weirdly", "massive and not textured".
All four were real and independently rooted (placement grid was actually fine).

- Cost: TurretCostOre 10 -> 40 (authoring default + the serialized Gameplay subscene value, which overrides the
  code default). A node yields 30 Ore, so a turret is now ~1.3 nodes instead of 1/3 of one.
- Cap: new Tuning.TurretCap=6, enforced server-authoritatively in BuildPlaceSystem (count live Base turrets while
  building the occupancy set; reject placement at the cap, same-tick-safe). Was unlimited.
- Model: the 1.6x Synty ballista (~5m on a 1m cell, clipping neighbours) scaled to 0.8 to fit one cell; the C5
  BoxCollider shrunk to match (0.8x1.2x0.8, center y 0.6); all 6 sub-renderers swapped off the flat untextured
  teal Mat_StructureOwned_Cyan to the Synty atlas PolygonFantasyKingdom_Mat_01_A (textured). Play-verified
  TurretCost=40 Ore / cap=6 baked; no exceptions.

Also fixes 3 EditMode tests that pinned the old dash knobs (the prior tuning commit changed iframe 12->14 /
cooldown 45->36 but I committed it without re-running tests): DashSystemTests now derives the expected dash speed
from TuningConfig.Defaults() (robust to future tuning) + asserts now+14/+36; TuningConfigTests pins the new
defaults. 390/390 EditMode green.

Investigation: wf_c6c87dc5-9c3 (turret lane). Operator fork: 40 Ore + cap 6 (stricter).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Assets/_Project/Prefabs/Turret.prefab

@@ -28,7 +28,7 @@ Transform:
   serializedVersion: 2
   m_LocalRotation: {x: 0, y: -0, z: -0, w: 1}
   m_LocalPosition: {x: 0, y: 0, z: 0}
-  m_LocalScale: {x: 1.6, y: 1.6, z: 1.6}
+  m_LocalScale: {x: 0.8, y: 0.8, z: 0.8}
   m_ConstrainProportionsScale: 0
   m_Children:
   - {fileID: 8624793677999475166}
@@ -67,7 +67,7 @@ MeshRenderer:
   m_RenderingLayerMask: 1
   m_RendererPriority: 0
   m_Materials:
-  - {fileID: 2100000, guid: 53c360a5b4f92c04caad3273e9bb5bef, type: 2}
+  - {fileID: 2100000, guid: 71e41e43b459a244abaf5acca76b89ee, type: 2}
   m_StaticBatchInfo:
     firstSubMesh: 0
     subMeshCount: 0
@@ -157,7 +157,7 @@ MeshRenderer:
   m_RenderingLayerMask: 1
   m_RendererPriority: 0
   m_Materials:
-  - {fileID: 2100000, guid: 53c360a5b4f92c04caad3273e9bb5bef, type: 2}
+  - {fileID: 2100000, guid: 71e41e43b459a244abaf5acca76b89ee, type: 2}
   m_StaticBatchInfo:
     firstSubMesh: 0
     subMeshCount: 0
@@ -248,7 +248,7 @@ MeshRenderer:
   m_RenderingLayerMask: 1
   m_RendererPriority: 0
   m_Materials:
-  - {fileID: 2100000, guid: 53c360a5b4f92c04caad3273e9bb5bef, type: 2}
+  - {fileID: 2100000, guid: 71e41e43b459a244abaf5acca76b89ee, type: 2}
   m_StaticBatchInfo:
     firstSubMesh: 0
     subMeshCount: 0
@@ -342,7 +342,7 @@ MeshRenderer:
   m_RenderingLayerMask: 1
   m_RendererPriority: 0
   m_Materials:
-  - {fileID: 2100000, guid: 53c360a5b4f92c04caad3273e9bb5bef, type: 2}
+  - {fileID: 2100000, guid: 71e41e43b459a244abaf5acca76b89ee, type: 2}
   m_StaticBatchInfo:
     firstSubMesh: 0
     subMeshCount: 0
@@ -475,8 +475,8 @@ BoxCollider:
   m_ProvidesContacts: 0
   m_Enabled: 1
   serializedVersion: 3
-  m_Size: {x: 1.6, y: 2, z: 1.6}
-  m_Center: {x: 0, y: 1, z: 0}
+  m_Size: {x: 0.8, y: 1.2, z: 0.8}
+  m_Center: {x: 0, y: 0.6, z: 0}
 --- !u!1 &4051895978514069616
 GameObject:
   m_ObjectHideFlags: 0
@@ -543,7 +543,7 @@ MeshRenderer:
   m_RenderingLayerMask: 1
   m_RendererPriority: 0
   m_Materials:
-  - {fileID: 2100000, guid: 53c360a5b4f92c04caad3273e9bb5bef, type: 2}
+  - {fileID: 2100000, guid: 71e41e43b459a244abaf5acca76b89ee, type: 2}
   m_StaticBatchInfo:
     firstSubMesh: 0
     subMeshCount: 0
@@ -633,7 +633,7 @@ MeshRenderer:
   m_RenderingLayerMask: 1
   m_RendererPriority: 0
   m_Materials:
-  - {fileID: 2100000, guid: 53c360a5b4f92c04caad3273e9bb5bef, type: 2}
+  - {fileID: 2100000, guid: 71e41e43b459a244abaf5acca76b89ee, type: 2}
   m_StaticBatchInfo:
     firstSubMesh: 0
     subMeshCount: 0
@@ -723,7 +723,7 @@ MeshRenderer:
   m_RenderingLayerMask: 1
   m_RendererPriority: 0
   m_Materials:
-  - {fileID: 2100000, guid: 53c360a5b4f92c04caad3273e9bb5bef, type: 2}
+  - {fileID: 2100000, guid: 71e41e43b459a244abaf5acca76b89ee, type: 2}
   m_StaticBatchInfo:
     firstSubMesh: 0
     subMeshCount: 0