Fix #985: Add lower-bound validation in CI_LAB_DecodeInputMessage to reject zero-length packets#990
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… to reject zero-length packets
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Closes #985
Added MsgSize < sizeof(CFE_MSG_Message_t) check in CI_LAB_DecodeInputMessage() to reject undersized packets before they are forwarded to the Software Bus. This is consistent with the fix applied in CFE_SB_MessageTxn_SetContentSize() (cFE PR #2702).
Same root cause as cFE #2697, #2698, #2699 — CCSDS Length field trusted without lower-bound validation.