diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..758a40e
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,3 @@
+engine/** filter=lfs diff=lfs merge=lfs -text
+*.pck filter=lfs diff=lfs merge=lfs -text
+*.exe filter=lfs diff=lfs merge=lfs -text
diff --git a/README.md b/README.md
index 2ef341c..7558d62 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,11 @@
-# builds
+# tinqs/builds
 
-Build artifacts (engine editor binaries, exports). Binaries via LFS/releases.
\ No newline at end of file
+Build artifacts for the Tinqs stack — engine editor binaries and game exports.
+**Binaries are stored via Git LFS** (see `.gitattributes`). Source lives in `tinqs/engine`,
+`tinqs/ariki-game`, `tinqs/ariki-sim`. See `manifest.json` for what's here.
+
+Long-term plan: CI (Gitea Actions) builds on push and publishes here / to S3 — see
+`docs/ai/plans/build-pipeline-architecture-2026-06-07.md`.
+
+## Current contents
+- `engine/macos-arm64/tinqs.macos.editor.arm64.mono` — Godot 4.6.3 fork editor (mono), built on Kraken with Xcode 26.3.
diff --git a/engine/macos-arm64/tinqs.macos.editor.arm64.mono b/engine/macos-arm64/tinqs.macos.editor.arm64.mono
new file mode 100755
index 0000000..1ec4f4c
--- /dev/null
+++ b/engine/macos-arm64/tinqs.macos.editor.arm64.mono
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:e1d359724a99858f03280e3bad4a758585f338c0e5dbd04ee63af7ad6ebd542d
+size 134146608
diff --git a/manifest.json b/manifest.json
new file mode 100644
index 0000000..49b7a79
--- /dev/null
+++ b/manifest.json
@@ -0,0 +1,15 @@
+{
+  "engine": {
+    "macos-arm64": {
+      "binary": "engine/macos-arm64/tinqs.macos.editor.arm64.mono",
+      "version": "4.6.3.stable.mono",
+      "engine_repo": "tinqs/engine",
+      "engine_commit": "01413b2",
+      "target": "editor",
+      "built_on": "2026-06-08",
+      "toolchain": "Xcode 26.3 (Apple clang 17)",
+      "scons_flags": "platform=macos target=editor arch=arm64 module_mono_enabled=yes vulkan",
+      "note": "Editor binary only. .NET assemblies (GodotSharp) built separately. Run with the existing game .pck."
+    }
+  }
+}