A card may deliver the response packet (the PoR) in the GET RESPONSE of
an ENVELOPE that answered 61xx and signal a proactive command pending in
the same answer (91xx - the CAT success state, not an error).
_send_envelope ran the chain and then cleared the response data
(`data, sw = '', '9000'`), so the operation reported no PoR although the
card had returned one (live 2026-10-14: a GP DELETE answered 6113, the
GET RESPONSE delivered the PoR with 9130, and the delete verdict showed
"ok (no PoR)").
The delivered bytes are kept now; the chain still runs and the exchange
reports 9000. Test: the delivered PoR survives the chain (verified to
fail on the old code). 917 frontend + 928 Python; sw cache simple-v444.
catarrh
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