9d86218b13
User reported Ctrl+Space didn't toggle list items. Three things contributed: 1. **Terminal byte ambiguity.** Different terminals encode Ctrl+Space differently — GUI / kitty protocol sends `<C-Space>`, xterm and most legacy terms send NUL which Vim sees as `<C-@>` (or, in some Neovim builds, `<Nul>` in keymap.lhs). The previous keymap registered only `<C-Space>` + `<C-@>`. Added the `<Nul>` alias too (both Lua and VimL paths) so the binding fires regardless of what byte the user's terminal produces. 2. **Deprecated `vim.lsp.util.make_position_params`.** Neovim 0.12 requires `position_encoding` explicitly. The old no-arg call now prints a deprecation warning, and in stricter setups returns nil — which made the command's `arguments` malformed and the `executeCommand` request silently fail. `position_params()` now pulls `offset_encoding` from the resolved client and passes both args, with a `pcall`-guarded fallback to the no-arg form for Neovim < 0.10. 3. **Deprecated `client.request(...)` dot-call.** Same Neovim 0.12 change — `Client:request()` is the method form. Use the colon call now; both arities are preserved for back-compat. Verified end-to-end: feeding all three of `<C-Space>` / `<C-@>` / `<Nul>` via `nvim_feedkeys` toggles the checkbox; `:messages` no longer carries the deprecation warnings. 381 tests still pass. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>