Add Gateway 2.0 implementation to Cosmos driver#4319

Draft

tvaron3 wants to merge 46 commits intoAzure:release/azure_data_cosmos-previewsfrom

tvaron3:tvaron3/gateway-2.0-impl

Commits on Apr 20, 2026

Cosmos: add Gateway 2.0 design spec

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Cosmos: address PR deep-review findings on Gateway 2.0 spec

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Cosmos: address second-pass review of Gateway 2.0 spec

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Cosmos: drop Java parity subsection from Gateway 2.0 spec

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Cosmos: resolve Q1/Q3 + clarify Q4 in Gateway 2.0 spec

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Cosmos: drop Retry Decision Table from Gateway 2.0 spec

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Cosmos: drop Gateway 2.0-specific failure fallback from spec

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Cosmos: fix RNTBD expansion in Gateway 2.0 spec

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Cosmos: fix Gateway 2.0 spec analyze failures

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Commits on Apr 26, 2026

Merge remote-tracking branch 'upstream/release/azure_data_cosmos-previews' into tvaron3/gateway-2.0-design
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Commits on Apr 27, 2026

Commits on Apr 29, 2026

Commits on Apr 30, 2026