ci: merge julia-engine extension tests into test tree before running

Copy docs and smoke test files from the julia-engine subtree into
the main test directories so they are discovered by the test runner.
This avoids duplicating tests — the extension repo is the single
source of truth.

Author: jkrumbiegel

.github/workflows/test-smokes.yml

@@ -241,6 +241,17 @@ jobs:
           echo "Julia Jupyter:"
           uv run julia --project=. -e "import IJulia;println(IJulia.JUPYTER);println(IJulia.find_jupyter_subcommand(\"notebook\"))"
 
+      # Julia engine tests live in the julia-engine extension repo
+      # (PumasAI/quarto-julia-engine) and are pulled in via git subtree.
+      # We merge them into the test tree here so the test runner discovers
+      # them alongside the other smoke tests, avoiding test duplication.
+      - name: Merge julia-engine tests into test tree
+        shell: bash
+        run: |
+          SUBTREE=src/resources/extension-subtrees/julia-engine/tests
+          cp -r "$SUBTREE/docs/julia-engine" tests/docs/julia-engine
+          cp -r "$SUBTREE/smoke/julia-engine" tests/smoke/julia-engine
+
       - name: Setup timing file for timed test
         if: ${{ matrix.time-test == true }}
         run: |