rerun-sdk: fix test_lerobot_reader.py assets + deselect test_optimized_stream.py's datafusion tests

The 9 remaining 0.38.1 test failures (0.38.0 shares the same test suite)
split into two distinct root causes, not one:

- test_lerobot_reader.py (5 tests): FileNotFoundError, not datafusion.
  CIBW_TEST_SOURCES only copied importer_mcap's own fixtures
  (${RE_IMPORTER_DIR}/src/importer_mcap/tests/assets); the new-in-0.38.x
  LeRobot fixtures live at the sibling path
  ${RE_IMPORTER_DIR}/tests/assets/lerobot and were never added. Add that
  path instead of ignoring the file -- it's a missing fixture, not a
  missing riscv64 wheel. The path exists (unused) in 0.37.2 too, so this
  is a no-op there.

- test_optimized_stream.py (4 of its 8 tests): genuine
  ModuleNotFoundError: datafusion, via ChunkStore.reader()'s lazy
  `import datafusion` (same missing riscv64 wheel as
  test_datafusion_utils.py/test_server.py). Its other 4 tests don't call
  `.reader()` and pass, so deselect the 4 failing ones individually
  instead of ignoring the whole file -- same pattern already used for
  test_multi_stream.py::test_isolated_streams and
  test_send_dataframe.py::test_send_dataframe_roundtrip.

Verified by grepping rerun-sdk's own test suite (rerun-io/rerun @ 0.38.1)
for every `.reader(` and `import datafusion` usage: these are the only
two files among the currently-collected tests that reach it.

Author: luhenry

.github/workflows/build-rerun-sdk.yml

@@ -225,10 +225,19 @@ jobs:
           # "Resolve re_importer crate path" step) and the animated_urdf
           # example data are the same shape for test_mcap_reader.py /
           # test_urdf_tree.py. Cargo.toml is test_version.py's own fixture
-          # (it parses the workspace version straight out of it).
+          # (it parses the workspace version straight out of it). The
+          # `tests/assets/lerobot` fixtures (new in 0.38.x, present but unused
+          # by any test in 0.37.2) are a sibling of importer_mcap under
+          # `${RE_IMPORTER_DIR}/tests`, not under `src/importer_mcap/tests`;
+          # test_lerobot_reader.py resolves them via
+          # `Path(__file__).parents[3] / "crates/data_flow/re_importer/tests/
+          # assets/lerobot"` and without this line the whole file fails with
+          # `FileNotFoundError: LeRobot dataset not found` -- not a datafusion
+          # issue, just a missing test-sources entry from the 0.38.x bump.
           CIBW_TEST_SOURCES: >-
             rerun_py/tests rerun_py/pyproject.toml tests/assets
             ${{ env.RE_IMPORTER_DIR }}/src/importer_mcap/tests/assets
+            ${{ env.RE_IMPORTER_DIR }}/tests/assets/lerobot
             examples/rust/animated_urdf/data Cargo.toml
           # e2e_redap_tests needs the "server" Cargo feature (not built, see
           # the scope note above) to start its local catalog server.
@@ -256,6 +265,17 @@ jobs:
           # it hits the test's 5s join() timeout consistently on this
           # runner but not the reason any other test here was dropped --
           # deselect, don't chase (CLAUDE.md gotcha 14).
+          # test_optimized_stream.py (new in 0.38.x) is the same "single
+          # failures in an otherwise-passing file" shape as
+          # test_multi_stream.py::test_isolated_streams and
+          # test_send_dataframe.py::test_send_dataframe_roundtrip above: only
+          # the 4 tests that call `ChunkStore.reader()` (which lazily does
+          # `import datafusion` in rerun_sdk/rerun/chunk/_chunk_store.py, same
+          # missing riscv64 wheel as test_datafusion_utils.py/test_server.py)
+          # fail; its other 4 tests (test_merge_quality, test_layout_snapshot,
+          # test_laziness, test_own_chunk_rules) don't touch `.reader()` and
+          # pass, so they're deselected individually rather than the whole
+          # file ignored.
           CIBW_TEST_COMMAND: >-
             cd rerun_py &&
             python -c "import rerun_bindings.rerun_bindings as m; assert m.__file__.endswith('.so'), m.__file__" &&
@@ -282,6 +302,10 @@ jobs:
             --deselect=tests/unit/test_multi_stream.py::test_isolated_streams
             --deselect=tests/unit/test_send_dataframe.py::test_send_dataframe_roundtrip
             --deselect=tests/unit/test_multiprocessing_gc.py::test_multiprocessing_gc
+            --deselect=tests/integration/test_optimized_stream.py::test_data_equality
+            --deselect=tests/integration/test_optimized_stream.py::test_chunk_store_path
+            --deselect=tests/integration/test_optimized_stream.py::test_sweep_order_observable
+            --deselect=tests/integration/test_optimized_stream.py::test_own_chunk_default
 
       - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
         with: