Q LSP: document error code names, and/or return a map/enum on init?

[justinmk3]

Problem

When Q LSP returns an error, it includes a code field.

Example:

[DEBUG][2025-02-20 07:08:49] .../vim/lsp/rpc.lua:393	"rpc.receive"	{ error = { code = -32800, message = "Request cancelled." }, id = 2, jsonrpc = "2.0" }

But the client doesn't have a mapping of these codes.

Expected behavior

Either document the codes, or perhaps send a mapping (dictionary) of name:code in the initialize response?