LSP compliance textDocument/completion #108
Description
Plugins like nvim-cmp provide features such as a completion menu and ghost text by utilizing the standard textDocument/completion command, as specified in the LSP documentation:
https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_completion. Currently, the command in use is llm-ls/getCompletions, but if we can ensure compliance with the LSP spec, it would unlock the full range of customization options offered by completion plugins.