feat: implement spill callback for cross-task memory eviction [experimental]#3869

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andygrove wants to merge 12 commits intoapache:mainfrom

andygrove:memory-profiling-tools

Commits on Apr 1, 2026

feat: add memory profiling script and analysis for off-heap usage
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docs: move memory analysis into contributor guide
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docs: add benchmark results and fix memory-profile.sh time parsing
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docs: add shuffle isolation results and PR 3845 notes
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feat: add SpillState for cross-thread spill coordination
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feat: wire SpillState into CometUnifiedMemoryPool
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feat: add JNI requestSpill function with SpillState in ExecutionContext
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feat: implement spill() callback in CometTaskMemoryManager
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feat: wire native plan handle to CometTaskMemoryManager for spill routing
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docs: update memory analysis with spill callback results
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chore: apply cargo fmt and prettier formatting
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docs: remove standalone memory-management doc, add spill coordination to development guide
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