From your section containing:
"...A common issue with compression schemes involving pre-shared dictionaries is ensuring that all parties use the same version of the dictionary.

It is expected that, as the CoT ecosystem develops, new patterns will emerge, prompting further revisions of the shared dictionary. In that case, it is important to understand that the use of mismatched dictionaries will lead to data loss or corruption, therefore it is critical to ensure that all parties in the communication use the exact same version of the dictionary.

A mechanism for solving this issue is outside the scope of this study, and therefore remains an open problem for the application developer to solve..."

I'd propose reserving up to 2 bytes as a dictionary version number using a psuedo Huffman Tree at the beginning of the string (last dictionary bit must be zero). This would allow immediate dictionary mismatch detection, and allow more conservative use of future dictionary definition space, since you ony really need to add new entries to a dictionary, you don't need to depreciate entire dictionaries. A 16-bit space would give 16 dictionary versions (yes, limited) but would also not require the additional bit-length until later version of the dictionary are made available with unique dictionary entries from all previous versions - the first release would be "0", second "10", etc. You would thus only use a similar amount of additional code space in controlling versions as you would a true greedy Huffman Tree.

Being able to detect the dicitonary mismatch would allow a return query to the sender for the specific dictionary entry used for the recently sent message, further economizing on the necessary data in transit. As an example, if version 1 ("0") was already in a release, and it received a packet with a version 4 ("1110"), it would only need the version 4 dictionary contents until it receives another version in the wild. Version 2 and 3 dictionaries wouldn't need to be sent from the sender to the receiver. The request for a dictionary's contents should be a one-time thing, meaning that you gain effectively some temporal channel compression. The now updated receiver would have another dictionary to regex against, potentially improving the return-path compression.

Having the dictionary version and mismatch detection tightly coupled would allow for the oportunity of packing a dictionary request in the as-of-yet-decompressed packet's ACK to the sender.