feat(vortex-geo): add intersection scalar function

[HarukiMoriarty]

Stacked on #9219.

Summary

• add native polygonal intersection overloads backed by geo::BooleanOps: Polygon × Polygon, Polygon × MultiPolygon, MultiPolygon × Polygon, and MultiPolygon × MultiPolygon
• return a native 2D MultiPolygon for every overload
• preserve constant/column execution and strict null propagation through the existing binary dispatcher
• add Q9-oriented coverage for overlap, disjoint, boundary-touching, holes, constants, nulls, and all four input-type combinations
• add focused rectangle and detailed-boundary microbenchmarks

NaN/invalid-coordinate checking remains outside the default execution path, consistent with the rest of the native geo scalar stack.

Checks

• cargo +nightly fmt --all
• cargo test -p vortex-geo (254 passed)
• cargo clippy -p vortex-geo --all-targets --all-features -- -D warnings
• cargo clippy --all-targets --all-features -- -D warnings
• cargo bench -p vortex-geo --bench intersection
• git diff --check

[codspeed-hq]

Merging this PR will improve performance by 82.38%

⚡ 1 improved benchmark
✅ 1911 untouched benchmarks
🆕 3 new benchmarks
⏩ 43 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	decompress[u64, (1000, 16)]	134.6 µs	73.8 µs	+82.38%
🆕	Simulation	nullable_rectangles	N/A	12.5 ms	N/A
🆕	Simulation	rectangles	N/A	13.4 ms	N/A
🆕	Simulation	thirty_two_vertex_boundaries	N/A	52.5 ms	N/A

Tip

Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing nemo/geo-intersection-native (af47d2b) with nemo/geo-convex-hull (ba1e979)}

Footnotes

1. 43 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. ↩