Add zoned layout scan planning and pruning rewrite

[joseph-isaacs]

Summary

• add a ZonedPlan physical node with a transparent data child and auxiliary zones child
• construct it from both current vortex.zoned layouts and legacy vortex.stats layouts
• carry the zone length required to preserve pruning semantics
• rewrite abstract statistic Eval expressions over ZonedPlan into zone-only pruning plans
• recursively optimize child plans and expose the node through the public plan API
• add plan-tree snapshots for current and legacy layouts, zoned pruning, and mixed row-index/data expressions

Scope

This PR owns zoned planning and optimization only. It does not materialize zone maps or execute plans. #9240 adds generic physical-plan execution, and #9244 materializes and executes zone-backed pruning.

Checks

• cargo test -p vortex-layout plan:: — 37 passed
• cargo clippy -p vortex-layout --all-targets --all-features -- -D warnings
• cargo +nightly fmt --all -- --check
• git diff --check origin/develop...HEAD

[codspeed-hq]

Merging this PR will degrade performance by 9.7%

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 1 improved benchmark
❌ 3 regressed benchmarks
✅ 1996 untouched benchmarks
⏩ 89 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	decompress[u64, (10000, 4)]	309.7 µs	400.9 µs	-22.75%
❌	Simulation	cold_misaligned[(64, 256)]	4.4 ms	5 ms	-12.26%
❌	Simulation	compress_fsst[(1000, 64, 8)]	1 ms	1.2 ms	-11.73%
⚡	WallTime	words_gather_dispatch[1024]	30 ns	27 ns	+11.11%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing vortex-plan-zoned (42470f5) with develop (806bdce)}

Footnotes

1. 89 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. ↩