Update the top-level README#2512

Draft

jmacd wants to merge 24 commits intoopen-telemetry:mainfrom

jmacd:jmacd/README2

Commits on Mar 23, 2026

Move phase1 results into ./docs; re-draft README
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Commits on Mar 30, 2026

Commits on Mar 31, 2026

merge
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Commits on Apr 1, 2026

Commits on Apr 2, 2026

again
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scree
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Jake
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Update README.md

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for alberts feedback
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nit
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contributing
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sanity
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Merge branch 'main' of github.com:open-telemetry/otel-arrow into jmacd/README2
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spell
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lint
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linty
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