diff --git a/engine/macos-arm64/terrain_3d/bin/libterrain.macos.debug.framework/_CodeSignature/CodeResources b/engine/macos-arm64/terrain_3d/bin/libterrain.macos.debug.framework/_CodeSignature/CodeResources
new file mode 100644
index 0000000..82736c8
--- /dev/null
+++ b/engine/macos-arm64/terrain_3d/bin/libterrain.macos.debug.framework/_CodeSignature/CodeResources
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:3de9ed42ab92f66b2c6033b59ccfa441b1d050c319daeeb557551b4da513147e
+size 1716
diff --git a/engine/macos-arm64/terrain_3d/bin/libterrain.macos.debug.framework/libterrain.macos.debug b/engine/macos-arm64/terrain_3d/bin/libterrain.macos.debug.framework/libterrain.macos.debug
new file mode 100755
index 0000000..aae9c72
--- /dev/null
+++ b/engine/macos-arm64/terrain_3d/bin/libterrain.macos.debug.framework/libterrain.macos.debug
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:653a16ffdc3e6bb05cf514b9700c943c8694133e28ec65800d074c58c13ea216
+size 1683648
diff --git a/engine/macos-arm64/terrain_3d/bin/libterrain.macos.release.framework/_CodeSignature/CodeResources b/engine/macos-arm64/terrain_3d/bin/libterrain.macos.release.framework/_CodeSignature/CodeResources
new file mode 100644
index 0000000..82736c8
--- /dev/null
+++ b/engine/macos-arm64/terrain_3d/bin/libterrain.macos.release.framework/_CodeSignature/CodeResources
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:3de9ed42ab92f66b2c6033b59ccfa441b1d050c319daeeb557551b4da513147e
+size 1716
diff --git a/engine/macos-arm64/terrain_3d/bin/libterrain.macos.release.framework/libterrain.macos.release b/engine/macos-arm64/terrain_3d/bin/libterrain.macos.release.framework/libterrain.macos.release
new file mode 100644
index 0000000..1aa6631
--- /dev/null
+++ b/engine/macos-arm64/terrain_3d/bin/libterrain.macos.release.framework/libterrain.macos.release
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:ca16b2a6afa80c382ffd578ebb6b31ce456a251ef8642e7d1addba79ef51d564
+size 1268560
diff --git a/engine/macos-arm64/tinqs.macos.editor.arm64.mono b/engine/macos-arm64/tinqs.macos.editor.arm64.mono
index 7a3df9f..80dd469 100755
--- a/engine/macos-arm64/tinqs.macos.editor.arm64.mono
+++ b/engine/macos-arm64/tinqs.macos.editor.arm64.mono
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:1dd8fbad55d07d20daf040dd790669893ece9783569e5060273ece33e4b68441
-size 134047536
+oid sha256:4599c0f90896e8f5d8a19a6a6ee9e5c987c6f0254f20daabc4f05c2d65497976
+size 134103280
diff --git a/manifest.json b/manifest.json
index d711e6a..bb2c97a 100644
--- a/manifest.json
+++ b/manifest.json
@@ -2,16 +2,16 @@
   "engine": {
     "macos-arm64": {
       "binary": "engine/macos-arm64/tinqs.macos.editor.arm64.mono",
-      "version": "4.6.3.stable.mono.custom_build.de00a306c",
+      "version": "4.6.4.stable.mono.custom_build.4fe1323a7",
       "engine_repo": "tinqs/engine",
-      "engine_commit": "de00a30",
-      "sha256": "1dd8fbad55d07d20daf040dd790669893ece9783569e5060273ece33e4b68441",
+      "engine_commit": "4fe1323",
+      "sha256": "4599c0f90896e8f5d8a19a6a6ee9e5c987c6f0254f20daabc4f05c2d65497976",
       "target": "editor",
-      "built_on": "2026-06-09",
-      "built_by": "Kraken (local build — pipeline not yet trusted/verified)",
+      "built_on": "2026-06-13",
+      "built_by": "Kraken (local build — engine 4.6.4, agent_skinned GPU-herd skinning fixed + visually verified)",
       "toolchain": "Xcode 26.3 (Apple clang 17)",
-      "scons_flags": "platform=macos target=editor arch=arm64 module_mono_enabled=yes vulkan",
-      "note": "Editor binary only, built from the squashed-history engine (de00a30). .NET assemblies (GodotSharp) + the Terrain3D addon are provided by the game project. Run with the existing ariki-game project."
+      "scons_flags": "platform=macos target=editor arch=arm64 module_mono_enabled=yes vulkan_sdk_path=~/VulkanSDK/1.4.350.0/macOS",
+      "note": "Editor binary, built from engine 4fe1323 (4.6.4). agent_skinned GPU skinned-herd renderer fixed + verified."
     },
     "windows-x64": {
       "binary": "engine/windows-x64/tinqs.windows.editor.x86_64.mono.exe",
@@ -26,7 +26,23 @@
       "built_by": "Forge (Ozan's Windows box — local build)",
       "toolchain": "MSVC VS BuildTools 2022 (vcvars amd64), SCons, mono glue + GodotSharp assemblies + D3D12 SDK",
       "scons_flags": "platform=windows target=editor module_mono_enabled=yes",
-      "note": "Branded editor binary (Tinqs app icon/splash/logos baked in). Built from engine 64fb5cc3ae (agent_skinned module, godot→tinqs branding renames, 4.6.4 version bump). .NET assemblies (GodotSharp) + the Terrain3D addon are provided by the game project. console_binary = the .console.exe variant for terminal stdout."
+      "note": "Branded editor binary. Built from engine 64fb5cc3ae (agent_skinned module, godot→tinqs branding, 4.6.4). Console binary included."
+    }
+  },
+  "terrain_3d": {
+    "macos-arm64": {
+      "debug_framework": "engine/macos-arm64/terrain_3d/bin/libterrain.macos.debug.framework",
+      "release_framework": "engine/macos-arm64/terrain_3d/bin/libterrain.macos.release.framework",
+      "sha256_debug": "653a16ffdc3e6bb05cf514b9700c943c8694133e28ec65800d074c58c13ea216",
+      "sha256_release": "ca16b2a6afa80c382ffd578ebb6b31ce456a251ef8642e7d1addba79ef51d564",
+      "engine_repo": "tinqs/engine",
+      "engine_commit": "bb8fe2f",
+      "built_against_engine_binary": "de00a306c",
+      "built_on": "2026-06-09",
+      "built_by": "Kraken",
+      "fix": "get_height no longer returns NaN at region borders.",
+      "install": "cp -R engine/macos-arm64/terrain_3d/bin/libterrain.macos.*.framework <ariki-game>/addons/terrain_3d/bin/",
+      "note": "GDExtension only — no engine rebuild needed."
     }
   }
 }