feat(client): enable fetch duplex mode automatically for streaming requests

[dinwwwh]

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Project	Deployment	Actions	Updated (UTC)
orpc	Ready	Preview, Comment	Jul 8, 2026 1:43pm

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commit: 5dc4bd9

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[pullfrog]

✅ No new issues found.

Reviewed changes — auto-detection and conditional injection of duplex: 'half' for streaming fetch request bodies.

• Add GET_SUPPORTED_DUPLEX_MODE detector in packages/client/src/adapters/fetch/transport.ts to probe runtime support for the RequestInit.duplex option.
• Conditionally set init.duplex when the fetch body is a ReadableStream and the detector reports support.
• Remove manual duplex: 'half' wrappers from integration test helpers across Bun, Hono Fetch, and Node HTTP client-server setups.
• Add unit tests in packages/client/src/adapters/fetch/rpc-link.test.ts covering supported and unsupported runtime behavior, and mock @orpc/shared once to make detection deterministic.

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