feat(config): read g:vimwiki_list on Neovim too (lazy.nvim drop-in)

The g:vimwiki_* drop-in was Vim-only: the Lua client read only setup()
opts and g:nuwiki_wikis, so swapping the vimwiki plugin for nuwiki under
lazy.nvim left the existing vim.g.vimwiki_list ignored and nuwiki pointed
at the default ~/vimwiki.

Mirror autoload/nuwiki/config.vim on the Lua side: config.lua now owns a
single resolver (M.wikis / M.scalar_globals) that resolves setup() wikis →
g:nuwiki_wikis → g:vimwiki_list (translating path->root, path_html->html_path,
template_*, ext->file_extension, …) and folds the global scalar defaults
(g:vimwiki_* then g:nuwiki_* then explicit setup() values; built-in defaults
excluded). lsp.lua (payload) and wiki_cfg/wiki_list (buffer commands) both
route through it, so the server and <Leader>ww agree on the wikis.

Extends test-global-shorthand (15 checks) with the vimwiki_list drop-in +
buffer-command resolution + native-wins cases. Config-parity goldens and
keymap harnesses green on both clients. README + known-issues updated
(drop-in is now Vim & Neovim).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

known-issues.md

@@ -128,15 +128,16 @@ correct as-is; the deferral is a deliberate risk/reward call.
 
 ## Notes
 
-- **Upstream `g:vimwiki_list` config (Vim).** When you haven't configured
-  nuwiki natively, the Vim client reads your upstream `g:vimwiki_list` +
-  `g:vimwiki_*` globals and translates them into nuwiki's schema (per-wiki
+- **Upstream `g:vimwiki_list` config (Vim & Neovim).** When you haven't
+  configured nuwiki natively, both clients read your upstream `g:vimwiki_list` +
+  `g:vimwiki_*` globals and translate them into nuwiki's schema (per-wiki
   `path`/`path_html`/`template_*`/`auto_export`, plus globals `toc_header`,
   `toc_header_level`, `html_header_numbering`, `html_header_numbering_sym`,
-  `links_space_char`, `list_margin`). `g:nuwiki_*` always wins. Globals nuwiki
-  doesn't model (e.g. `automatic_nested_syntaxes`) are ignored — see the
-  divergence list above. **Limitation:** this drop-in translation is currently
-  **Vim-only**; on Neovim, configure via `setup()` / `g:nuwiki_wikis`.
+  `links_space_char`, `list_margin`). `g:nuwiki_*` / `setup()` config always
+  wins. Globals nuwiki doesn't model (e.g. `automatic_nested_syntaxes`) are
+  ignored — see the divergence list above. On Neovim this means swapping the
+  `vimwiki` plugin for nuwiki under lazy.nvim works with your existing
+  `vim.g.vimwiki_list` untouched (call `require('nuwiki').setup()` with no args).
 - **Third-party plugin compatibility.** A shim at `autoload/vimwiki/vars.vim`
   exposes the subset of `vimwiki#vars#get_wikilocal` that plugins like
   vimwiki-sync and vim-zettel call (`path`, `ext`/`extension`, `syntax`,