✨ sdk: add DialContext/tcpConn and ActionContext.ShouldStop#1
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Summary
hostCaller三方同步新增IOSetDeadline/ActionShouldStop（sdk/go/opskat/hostcall.go+hostcall_wasm.go+hostcall_stub.go）sdk/go/opskat/tcp.go:DialContext/Dial/tcpConn实现net.Conn，签名契合 kafka-goTransport.Dial，SetDeadline / SetReadDeadline / SetWriteDeadline 通过host_io_set_deadline传回宿主ActionContext.ShouldStop()供长驻 action 轮询取消（sdk/go/opskat/opskat.go）TestHost增加WithMockTCP/WithActionCancel选项，IORead/IOWrite/IOClose/IOSetDeadline 对 TCP handle 分支处理Spec: 对应 opskat repo
docs/superpowers/specs/2026-04-23-kafka-extension-design.md§2Coupling: 必须与 opskat
feature/kafka-phase1-frameworkPR 同批次 merge，否则 hostABI 错位Test plan
go test ./...全绿（8 个单测：ActionCancellation、tcpConn round-trip、SetReadDeadline、ActionContext.ShouldStop 等）GOOS=wasip1 GOARCH=wasm go build .通过go vet ./...clean