ci(lint-subprocess): use --no-project so uv run skips fbuild install (#451)

The `Lint subprocess spawns` workflow runs only a stdlib-only Python
linter, but `uv run python ...` was triggering an editable install of
`fbuild`. The build backend requires a globally-installed `soldr` and
the workflow doesn't install one, so every PR's CI failed with:

    ERROR: `soldr` is required to build fbuild from source.

`--no-project` tells uv to skip the project sync. The script
(`ci/find_direct_subprocess.py`) carries a PEP 723 header declaring
only `requires-python = ">=3.10"` and no third-party deps, so no env
prep is needed.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: zackees

.github/workflows/lint-subprocess.yml

@@ -24,5 +24,14 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - uses: astral-sh/setup-uv@v3
+      # `--no-project` is load-bearing: without it, `uv run` triggers an
+      # editable install of the `fbuild` package, whose build backend
+      # requires a globally-installed `soldr` (see `setup.py` /
+      # `build_backend.py`). This workflow does not install soldr — it
+      # is a stdlib-only Python lint, not a Rust build — so the install
+      # fails with `ERROR: 'soldr' is required to build fbuild from
+      # source`. The script itself carries a PEP 723 header declaring
+      # only `requires-python = ">=3.10"` and no third-party deps, so
+      # skipping project sync is safe.
       - name: Check no unannotated direct Command::new spawns
-        run: uv run python ci/find_direct_subprocess.py --fail
+        run: uv run --no-project python ci/find_direct_subprocess.py --fail