* fix(sse): release reader and cancel stream on abort/error to prevent Undici pool socket leak
* test(sse): regression guard for Undici socket release on abort (#4309)
Proves collectStreamToResponse releases the reader and cancels the response
body on the abort/error path (fails without the fix, passes with it) — Rule #18.
Co-authored-by: diegosouzapw <diegosouza.pw@gmail.com>
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Co-authored-by: Dmitry Kuznetsov <dmitry@kuznetsov.me>
Co-authored-by: diegosouzapw <diegosouza.pw@gmail.com>
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