chore: cargo fmt

[mailletf]

Problem

The tree had been drifting from rustfmt (14 diffs at c4a9e30), so make check-rust fails on formatting alone and every code change has to dodge unrelated reformatting in its diff.

Fix

Run cargo fmt once, on its own. Every PR below this one in the stack was deliberately kept at the pre-existing baseline so its diff stays about its own change; from here up the tree is clean.

Pure formatting — no logic, no renames, no reordering beyond import sorting.

[mailletf]

This change is part of the following stack:

• fix: don't drop multipolygon parts whose seed lands in an earlier part #30
  • perf: cover polygons by descending the geohash tree #31
    • perf: expand geohash sets on packed integers instead of strings #32
      • fix: cap the expansion hop count instead of hanging near the poles #33
        • fix: release the GIL while covering a polygon #34
          • chore: delete the dead handbrake cover #35
            • chore: cargo fmt #36 ◀
              • perf: add Arrow-native WKB and EWKB output #37
                • perf: add Arrow-native encode and coordinate decode #38
                  • perf: optionally dictionary-encode geog_id in the Arrow mapping output #39
                  • perf: cover large polygons across Rayon workers #40

_{Change managed by git-spice.}

[Copilot]

Pull request overview

This PR brings the repository back into alignment with rustfmt by applying cargo fmt changes only, so subsequent PRs in the stack won’t carry unrelated formatting noise and make check-rust can pass formatting checks.

Changes:

• Reformatted Rust source in src/lib.rs (import grouping, line wrapping, indentation) without altering logic.
• Rewrapped Criterion benchmark macro invocation in benches/bench.rs for rustfmt compliance.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/lib.rs	Rustfmt-only reflow of imports and several multi-line expressions/asserts for consistent formatting.
benches/bench.rs	Rustfmt-only reformat of criterion_group! invocation into the standard multi-line style.

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