Fix the lint failures that are failing CI on main (ruff + clippy)

[HarperZ9]

What

The Lint and check docs build job is red on main, which (because it shares the workflow with the test matrix and fail-fast is on) cancels the test jobs too, so every PR shows all-red even though the Python suite passes. The lint job runs just lint = lint-python then lint-rust, and both halves currently fail from independent tool version bumps:

1. Python: ruff FURB110

ruff.toml uses lint.select = ["ALL"], which enables FURB110 ("Replace ternary if expression with or operator"), flagging:

FURB110  tests/adaptors/filesystem.py:51:28
FURB110  tests/adaptors/filesystem.py:52:44

Fix: replace x if x else {} with the idiomatic x or {} (the rule's prescribed fix; semantically identical for the falsy-to-{} default).

2. Rust: clippy collapsible_match

With the Python lint fixed, just lint proceeds to lint-rust, where cargo clippy --all-targets --all-features -- -D warnings fails on clippy 1.96's collapsible_match in rust/src/import_parsing.rs:131: the Expr::Attribute match arm wraps an if expr.attr.id == "TYPE_CHECKING" { ... } else { walk_stmt(...) }.

Fix: collapse it into a pattern guard (clippy's own suggested fix). The else branch was identical to the _ => fallthrough, so when the guard is false the statement is still walked. Behavior is unchanged.

Verification

Python, with the pinned ruff==0.14.8:

$ ruff check                # All checks passed!
$ ruff format --check       # 64 files already formatted

Rust, with the CI toolchain rust 1.96.0:

$ cargo fmt --check                                          # clean
$ cargo clippy --all-targets --all-features -- -D warnings   # clean
$ cargo check --release --all-targets                        # clean

On this PR the Lint and check docs build job now passes, which is the blocker that was cancelling the test matrix.

Note on the remaining red

After the lint job goes green the test matrix runs, and Run tests for Python 3.10, macos-latest fails during the maturin/pyo3 extension build with a macOS linker error (undefined _PyExc_* symbols, clang: linker command failed). That is a native-build/environment issue, not something this lint-only change touches, and I do not have permission to re-run jobs on this repo. A maintainer re-run (or a look at the macOS pyo3 build) would confirm.

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Disclosure: authored with AI assistance (Claude), reviewed and verified before submitting. Happy to adjust if you would rather handle either lint via config (pinning the tools or scoping the rules) instead.

[codspeed-hq]

Merging this PR will not alter performance

✅ 26 untouched benchmarks
⏩ 23 skipped benchmarks¹

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_{Comparing HarperZ9:fix/ruff-furb110-lint (ab39a71) with main (977b7f0)}

Footnotes

1. 23 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩