diff --git a/.gitattributes b/.gitattributes
index cfc7ca6..9d3eeb5 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,3 +1,5 @@
 # Preserve historical source bytes and SHA-256 across platforms. No EOL conversion.
 * -text
 *.jsonl.gz binary
+artifacts/**/*.tar.zst filter=lfs diff=lfs merge=lfs -text
+artifacts/lfs-smoke/*.bin filter=lfs diff=lfs merge=lfs -text
diff --git a/.gitignore b/.gitignore
index e43b590..1a790b1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,3 +34,5 @@ id_ed25519*
 /registry/verification-runs/
 # Historical learned deltas/checkpoints are not source files.
 /models/learned/
+# Explicit publication exports only; original scientific directories stay ignored.
+!/artifacts/**/*.tar.zst
diff --git a/artifacts/lfs-smoke/publication-probe.bin b/artifacts/lfs-smoke/publication-probe.bin
new file mode 100644
index 0000000..14e7590
--- /dev/null
+++ b/artifacts/lfs-smoke/publication-probe.bin
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:93e0e6c4ca4fdc123c21b859ba97d8bd73670eb9c90d04ce9a431d822b5393c5
+size 263