diff --git a/.github/workflows/export-source.yml b/.github/workflows/export-source.yml
new file mode 100644
index 0000000..81c2845
--- /dev/null
+++ b/.github/workflows/export-source.yml
@@ -0,0 +1,28 @@
+name: Export source snapshot
+
+on:
+  push:
+    branches: [agent/issues-1-9-export]
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  export:
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Check out exact source
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - name: Create deterministic source archive
+        run: |
+          tar --sort=name --mtime='UTC 2026-01-01' --owner=0 --group=0 --numeric-owner \
+            --exclude=.git --exclude=target \
+            -czf /tmp/vfd-lantern-source.tar.gz .
+      - name: Upload source archive
+        uses: actions/upload-artifact@v4
+        with:
+          name: vfd-lantern-source
+          path: /tmp/vfd-lantern-source.tar.gz
+          if-no-files-found: error
+          retention-days: 1