[PHP] fix: raise SIGPIPE for bridged TCP EPIPE#749
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(cherry picked from commit aede00b)
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Supersedes fork-headed PR #729. This replacement keeps the same head commit (9e252cf) but moves the PR head onto an Automattic/kandelo branch.
Why this is needed
PHP stream and socket tests expect writes to a closed bridged TCP peer to surface EPIPE and raise SIGPIPE where appropriate. Without that signal and error behavior, PHP observes non-Unix socket semantics.
Why this shape makes sense
The bridge should translate host TCP close behavior into the same error and signal model as Kandelo kernel sockets. Fixing it in the bridge benefits every package using bridged TCP.
Why this is the correct fix
Raising SIGPIPE on bridged TCP EPIPE aligns the host-backed path with standard Unix behavior and with the in-kernel socket semantics the PHP tests are validating.
Verification
Branch-location correction only. Replacement head SHA matches fork-headed PR #729 exactly.