need a registry of OSC (and other?) escape sequences
It would be nice to have a table of OSC codes used by various terminals, sorted numerically. The format could be roughly like xterm ctlseq. However, it should not strive for a precise specification; just a short summary, optional link to details/specification; and a list of terminal emulators that support the code (or maybe [many] if that is the case).
Change Window Title to Pt. [xterm, many]
OSC 8; params
OSC 8; ; ST
Explicit hyperlinks [many]
Set session-name to name [DomTerm]
Of course some numbers will conflict, but that is why having this registry would be useful.
It would also be useful to list/document other non-OSC extensions not in ctlseqs, but I suggest starting with OSC.