fix(parity): fifth-pass re-audit — VimwikiGoto nargs, autowriteall, table_auto_fmt

Closes the actionable fifth-pass findings (gap doc updated):

- VimwikiGoto / NuwikiGoto: -nargs=1 -> -nargs=* in all four defs. Was a
  real bug — `:VimwikiGoto` raised E471, `:VimwikiGoto My Page` raised E488,
  and the handler's empty-arg prompt fallback was unreachable. Both clients
  already prompt on empty, so -nargs=* (keeping -complete=pages) restores
  upstream behavior.

- autowriteall (upstream default ON): while a wiki buffer is current, mirror
  Vim's global 'autowriteall' (auto-save on page switch / :make), restoring
  the prior value on leave. Neovim via ftplugin.lua setup_autowriteall
  (BufEnter/BufLeave) gated by the `autowriteall` setup option; Vim via the
  NuwikiAutoWriteAll augroup gated by g:nuwiki_autowriteall.

- table_auto_fmt (upstream default ON): re-align the table under the cursor
  on InsertLeave. Both clients, gated by `table_auto_fmt` / g:nuwiki_table_auto_fmt,
  guarded on the cursor line containing `|` before the async table_align.

Also logged (no code): VimwikiRenameFile missing -nargs=? (subsumed by the
LSP-rename divergence), table_reduce_last_col, user_htmls, hl_headers/
hl_cb_checked, and a commentstring value-mismatch note. Mappings audit clean.

The Neovim harness disables table_auto_fmt in setup (its async re-align would
perturb the deterministic table-nav keystroke cases); its wiring is verified
on a throwaway scratch buffer instead. Docs (README + doc/nuwiki.txt) updated.
Tests: cmd.VimwikiGoto_accepts_multiword, config.autowriteall_applied,
config.table_auto_fmt_autocmd. Neovim 293, Vim 285/18/21 pass.

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

lua/nuwiki/config.lua

@@ -61,6 +61,15 @@ M.defaults = {
   -- back to a regex-based `foldexpr`. `'off'` skips folding setup.
   folding = 'lsp',
 
+  -- vimwiki `autowriteall` (default on): while a wiki buffer is current,
+  -- mirror Vim's global `'autowriteall'` so a modified buffer auto-saves on
+  -- page switch / `:make` etc., restoring the prior value on leave.
+  autowriteall = true,
+
+  -- vimwiki `table_auto_fmt` (default on): re-align the table under the
+  -- cursor when leaving insert mode.
+  table_auto_fmt = true,
+
   -- Broken-link diagnostic severity. Sent to the server, which downgrades
   -- or suppresses the diagnostic accordingly.
   --   'off' | 'hint' | 'warn' | 'error'

lua/nuwiki/ftplugin.lua

@@ -46,6 +46,54 @@ local function setup_folding(bufnr, folding_mode)
   })
 end
 
+-- vimwiki `autowriteall`: while this wiki buffer is current, mirror the option
+-- into Vim's global 'autowriteall' (auto-save on switch/make), restoring the
+-- prior value on leave.
+local function setup_autowriteall(bufnr, enabled)
+  if not enabled then
+    return
+  end
+  if bufnr == 0 then
+    bufnr = vim.api.nvim_get_current_buf()
+  end
+  local grp = vim.api.nvim_create_augroup('nuwiki_awa_' .. bufnr, { clear = true })
+  local function enter()
+    vim.b[bufnr].nuwiki_awa_saved = vim.o.autowriteall
+    vim.o.autowriteall = true
+  end
+  local function leave()
+    local saved = vim.b[bufnr].nuwiki_awa_saved
+    if saved ~= nil then
+      vim.o.autowriteall = saved
+    end
+  end
+  vim.api.nvim_create_autocmd('BufEnter', { buffer = bufnr, group = grp, callback = enter })
+  vim.api.nvim_create_autocmd('BufLeave', { buffer = bufnr, group = grp, callback = leave })
+  -- FileType fires after the initial BufEnter, so apply once now too.
+  enter()
+end
+
+-- vimwiki `table_auto_fmt`: re-align the table under the cursor on InsertLeave.
+local function setup_table_auto_fmt(bufnr, enabled)
+  if not enabled then
+    return
+  end
+  if bufnr == 0 then
+    bufnr = vim.api.nvim_get_current_buf()
+  end
+  local grp = vim.api.nvim_create_augroup('nuwiki_taf_' .. bufnr, { clear = true })
+  vim.api.nvim_create_autocmd('InsertLeave', {
+    buffer = bufnr,
+    group = grp,
+    callback = function()
+      -- Cheap guard: only round-trip to the server on a table row.
+      if vim.api.nvim_get_current_line():find('|', 1, true) then
+        require('nuwiki.commands').table_align()
+      end
+    end,
+  })
+end
+
 function M.attach(bufnr)
   bufnr = bufnr or 0
   local config = require('nuwiki.config')
@@ -59,6 +107,8 @@ function M.attach(bufnr)
   end
 
   setup_folding(bufnr, opts.folding or 'lsp')
+  setup_autowriteall(bufnr, opts.autowriteall ~= false)
+  setup_table_auto_fmt(bufnr, opts.table_auto_fmt ~= false)
 end
 
 return M