fix: release workflow — run maturin from workspace root

pyproject.toml was consolidated to the repo root; the working-directory
pointing at crates/hotcoco-pyo3 was stale and caused maturin to fail
with "pyproject.toml not found".

- Remove working-directory from build-wheels and build-sdist jobs
- Update artifact paths from crates/hotcoco-pyo3/dist/ → dist/

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: derekallman

.github/workflows/release.yml

@@ -65,12 +65,11 @@ jobs:
           target: ${{ matrix.target }}
           args: --release --out dist
           manylinux: auto
-          working-directory: crates/hotcoco-pyo3
 
       - uses: actions/upload-artifact@v4
         with:
           name: wheels-${{ matrix.target }}
-          path: crates/hotcoco-pyo3/dist/*.whl
+          path: dist/*.whl
 
   build-sdist:
     name: Build sdist
@@ -83,12 +82,11 @@ jobs:
         with:
           command: sdist
           args: --out dist
-          working-directory: crates/hotcoco-pyo3
 
       - uses: actions/upload-artifact@v4
         with:
           name: sdist
-          path: crates/hotcoco-pyo3/dist/*.tar.gz
+          path: dist/*.tar.gz
 
   # ── PyPI publish ───────────────────────────────────────────────────────
   publish-pypi: