docs(client): document gl/gL list change-symbol mappings

Add gl<sym>/gL<sym> to the lists keymap tables in README and help, noting
that 1) is command-only. Tick parity gap P1 #2.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

development/vimwiki-gap.md

@@ -23,10 +23,14 @@ fix site.
   aliases; `follow_link_drop()` helper in `autoload/nuwiki/commands.vim`;
   true `:tab drop` tab-reuse wired in both clients (`lua/nuwiki/commands.lua`
   `open_uri` `'tabdrop'` case); `<C-S-CR>` repointed to tab-drop.
-- [ ] **`gl<symbol>` change-symbol mappings** — upstream's one-key bullet/number
+- [x] **`gl<symbol>` change-symbol mappings** — upstream's one-key bullet/number
   symbol change (`gl*` `gl#` `gl-` `gl1` `gla` `gli` … plus `gL…`) has no
   nuwiki keymap; only `:…ChangeSymbol*` commands exist.
-  _Fix:_ `lua/nuwiki/keymaps.lua` lists group, `ftplugin/vimwiki.vim` lists block.
+  _Fix:_ added normal-mode `gl{-,*,#,1,i,I,a,A}` (item) + `gL…` (whole list) in
+  `lua/nuwiki/keymaps.lua` lists group and `ftplugin/vimwiki.vim` Vim-branch
+  lists block, wired to the existing `list_change_symbol`. `1)` stays
+  command-only (upstream shadows it with `1.`); normal-mode only (server acts on
+  cursor item / whole list, not a visual range).
 - [ ] **`gl<Space>` / `gL<Space>` semantics diverge** — upstream = *remove
   checkbox* from item / list siblings; nuwiki rebinds to *remove done items*.
   Same keys, different effect (parity trap). Remove-checkbox is command-only in