Columnar rendering: complete migration (Prompts 2.3–10.1)#179

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antiguru wants to merge 11 commits intocolumnar_renderingfrom

claude/complete-prompt-task-KOaiS

Commits on Mar 25, 2026

Fix clippy warnings in columnar test code
claude
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Apply rustfmt formatting fixes
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Add Phase 11 prompts: direct columnar processing without Vec escape hatches
claude
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Columnar flat_map: iterate &RowRef directly without Vec conversion (Prompt 11.1)
claude
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Columnar as_specific_collection: identity path returns columnar directly (Prompt 11.2)
claude
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Verify columnar as_collection_core MFP paths (Prompt 11.3)
claude
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Verify Reduce uses columnar flat_map directly (Prompt 11.4)
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Columnar FlatMap: direct &RowRef processing via unary_fallible (Prompt 11.5)
claude
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Columnar ArrangeBy: arrange_columnar_collection iterates &RowRef directly (Prompt 11.6)
claude
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Use copy_from instead of into_owned for columnar iteration buffers
claude
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Pass timestamp and diff by reference in flat_map logic closures
claude
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