After reviewing the various Cisco docs in more detail, I noted some inconsistencies between two different 9100 series hardware install guides (online vs PDF), so I opened a case with Cisco to confirm the behavior of the devices once the cables have been implemented.
This appears to be a case of poorly-written documentation. The switches do not "stack" to create a single logical switch. When connected, the switches will form an ISL** and retain separate domain ID's, which is the behavior I've verified by reviewing the showtech details for two switches connected this way.
**The 'Cisco MDS 9100 Series Hardware Installation Guide' (OL-21514-01) states:
A 64-port switch can be formed out of Cisco two MDS 9134 Switches by using a copper CX4 X2 transceiver as an Inter-Switch Link (ISL).
VMware Trunk Port Group is supported from ACI version 2.1
VMM integration must be configured properly
ASA device package must be uploaded to APIC
ASAv version must be compatible with ACI and device package version
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