feat(13.1): colorize + color_dic → ColorNode renderer

Closes the last pending §13.1 entries:

- **`nuwiki.colorize`** (client-side, Lua + VimL) — wraps the word
  at cursor (or the visual selection on Neovim) in an inline
  `<span style="color:%c">…</span>` template. Matches vimwiki's
  default `color_tag_template`. Bound to `<Leader>wc` in both
  normal and visual mode on both editor paths; the previous
  "deferred" stub is gone.

- **`color_dic` → renderer** — `HtmlConfig` gains a
  `color_dic: HashMap<String, String>` field reading the same key
  out of `initializationOptions` / `didChangeConfiguration`. The
  HTML export path threads it into `HtmlRenderer::with_colors`;
  `ColorNode` now picks `style="color:<value>"` when the colour
  name is in the dict, falling back to the existing
  `class="color-<name>"` when it isn't.

SPEC §13.1 is fully checked off — the table moved from "deferred
sketch" to a per-command status table marking all 11 commands done,
plus a note on the `color_dic` follow-up landing alongside. README's
"Phase 14 list & table edit commands" row now reads ✅ without the
deferred-subset caveat, and the §13.1-blocked text-objects note in
the keymaps section is rephrased as "planned follow-ups".

Tests: 4 new in `phase17_colorize.rs` covering the renderer
fallback when the dict is empty, the inline-style emission for a
listed name, the fallback path for an unlisted name in a populated
dict, and the `initializationOptions` JSON shape. Total 414 Rust
tests pass; clippy clean; keymap harness still 20/20.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

autoload/nuwiki/commands.vim

@@ -559,8 +559,37 @@ function! nuwiki#commands#table_move_right() abort
         \ }]
   call s:exec('nuwiki.table.moveColumn', l:args)
 endfunction
-function! nuwiki#commands#colorize(color) abort
-  call s:notify_deferred(':VimwikiColorize')
+" `:VimwikiColorize {color}` — pure-VimL wrap as inline span tag,
+" matching vimwiki's `<span style="color:%c">%s</span>` template.
+function! nuwiki#commands#colorize(...) abort
+  let l:color = a:0 >= 1 ? a:1 : ''
+  if l:color ==# ''
+    let l:color = input('Colour: ')
+  endif
+  if l:color ==# ''
+    return
+  endif
+  let l:open_tag = '<span style="color:' . l:color . '">'
+  let l:close_tag = '</span>'
+  let l:line = getline('.')
+  let l:col = col('.')
+  " Word boundaries around cursor (1-based).
+  let l:left = l:col
+  while l:left > 1 && strpart(l:line, l:left - 2, 1) =~# '[A-Za-z0-9_-]'
+    let l:left -= 1
+  endwhile
+  let l:right = l:col
+  while l:right <= strlen(l:line) && strpart(l:line, l:right - 1, 1) =~# '[A-Za-z0-9_-]'
+    let l:right += 1
+  endwhile
+  let l:word = strpart(l:line, l:left - 1, l:right - l:left)
+  if l:word ==# ''
+    return
+  endif
+  let l:new = strpart(l:line, 0, l:left - 1)
+        \ . l:open_tag . l:word . l:close_tag
+        \ . strpart(l:line, l:right - 1)
+  call setline('.', l:new)
 endfunction
 " §13.1 Cluster C — link helpers.