v6: fix transport error metadata, subscription teardown, and the spec accept header#4429

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trevor-scheer wants to merge 6 commits into

trevor/transport-correctness

Commits on Jul 15, 2026

Fix transport error-body handling, accept header, and ok semantics
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Fix subscription Stop leaking the socket, and abort in-flight requests
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Add an onError transport hook
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Document extensions/signal in the create-transport README, fix legacyClient typo
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Extend the transport-api changeset for the correctness fixes
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Update the HTTP-failure e2e expectation to the real error body
trevor-scheer
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