Upgrades the blank-body heuristic to NT's exact discriminator. RE of
wrapper.linux.node (msg_header_codec_helper.cc::DecodeRoutingHead, sub_3B42650)
shows the official client classifies a C2C push by (svr_msg_type, c2c_cmd):
msgType ∈ {141,166,167} with c2c_cmd ∈ {1,73,75,129,131,133,135,192} is routed
through OnRecvSysMsg (long_cnn_msg_mgr.cc) as a system/control signal and never
shown as a chat bubble — the group-invite "[空消息]" phantom is one of these.
- proto-defs: ContentHead field 3 was mislabelled `divSeq`; it is `c2c_cmd`.
Renamed (only other use was forward.ts, which zeroes it on a fake send).
- MsgPushHead now carries c2cCmd; new isC2cControlPush() in blank-filter.ts.
- parseMsgPush + both history fetches drop control pushes by (msgType, c2cCmd)
regardless of body, so a control signal carrying stray content is caught too
(not just the empty case). isBlankMessage stays as the fallback for
content-less pushes we don't yet classify by cmd. Live path debug-logs a
control push that carried elements, in case the table ever eats real content.
NOTE: the c2c_cmd set is taken from NT; we have not captured #24's actual cmd
(our diagnostic never logged field 3), so the blank fallback remains load-bearing
until a live capture confirms which cmd the invite phantom uses.
DrSmoothl
e0d5b47488