Rework mmap index into standalone readable/readonly/writable implementations and evaluate end-to-end impact#313

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Commits on May 14, 2026

Reimplement mmap index as standalone readable/readonly/writable classes

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Address mmap follow-up review comments and align index docs

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Change mmap range/all to generators and support reverse ranges

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albe
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Switch mmap range/all to generators and add reverse traversal

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albe
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Align mmap benchmark with production durable write path

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Split index benchmark into separate read/write suites without open-close timing

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Use manual read/write index benchmark without open-close timing

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Add mmap range cache filled during iteration

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Refine mmap cache tracking and rerun benchmark

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revert range/all in MmapReadableIndex to return arrays

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