fix(lists): VimwikiToggleRejectedListItem -range parity (P3)

Upstream's :VimwikiToggleRejectedListItem is -range and binds glx in
visual mode; nuwiki's four defs were bare, so a ranged invocation raised
E481 and acted cursor-only. Same -range class already fixed for
ToggleListItem/Increment/Decrement -- ToggleRejected was missed.

All four defs (Vim+Neovim x Vimwiki*/Nuwiki*) are now -range, routed
through a new reject_list_item_range(l1, l2) looping over_range in both
clients, mirroring toggle_list_item_range. Visual glx stays cursor-only,
consistent with its <C-Space>/gln/glp siblings.

Also logs the 2026-06-02 re-audit findings in development/vimwiki-gap.md:
RemoveDone lost -range (low pri); config gaps list_margin
semantics/markdown-default, diary_months, markdown_header_style,
diary_caption_level=-1; and the path_html/template_path default-location
divergences. Mappings audit came back clean.

Tests: cmd.reject_list_item_range (test-keymaps.lua),
cmd.VimwikiToggleRejectedListItem_accepts_range (test-keymaps-vim.vim).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

development/tests/test-keymaps.lua

@@ -808,6 +808,22 @@ vim.defer_fn(function()
       error('range toggle incomplete: ' .. vim.inspect(vim.api.nvim_buf_get_lines(0, 0, -1, false)))
     end
   end)
+  -- `:1,3VimwikiToggleRejectedListItem` — now -range (was bare → E481 on a
+  -- ranged invocation, and cursor-only). Each line should gain a rejected
+  -- checkbox `[-]`.
+  tobj_case('cmd.reject_list_item_range', function()
+    set_buf({ '- [ ] a', '- [ ] b', '- [ ] c' })
+    vim.cmd('1,3VimwikiToggleRejectedListItem')
+    local done = vim.wait(2000, function()
+      for _, l in ipairs(vim.api.nvim_buf_get_lines(0, 0, -1, false)) do
+        if not l:match('%[%-%]') then return false end
+      end
+      return true
+    end, 30)
+    if not done then
+      error('range reject incomplete: ' .. vim.inspect(vim.api.nvim_buf_get_lines(0, 0, -1, false)))
+    end
+  end)
   -- `:VimwikiTable {cols} [rows]` — now -nargs=* (was -nargs=1, which dropped
   -- the args entirely). A 4-col table has 5 pipes per row; 3 data rows give
   -- header + separator + 3 = 5 table lines.