chore(release): bump version to 0.2.0

Minor feature release over v0.1.0 (124 commits). Highlights:
- Drop-in upstream g:vimwiki_list / g:vimwiki_* config (Vim) + global
  per-wiki defaults shorthand (both clients)
- Programmatic coc.nvim registration (no hand-written coc-settings.json)
- :NuwikiTOC / GenerateLinks / GenerateTagLinks insert at the cursor line;
  scoped :NuwikiGenerateLinks <path> wired up
- HTML export: heading id anchors, div.toc wrapper, section numbering;
  toc_header/level honoured in single-wiki config
- The full P3 config/command/mapping parity batch + R1–R18 review fixes

Bumps the workspace version, the inter-crate path-dep requirements, and
g:nuwiki_version.

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

plugin/nuwiki.vim

@@ -15,7 +15,7 @@ let g:loaded_nuwiki = 1
 " Plugin version, surfaced by :VimwikiShowVersion / :NuwikiShowVersion.
 " Set before the Neovim early-return below so both clients see the global.
 if !exists('g:nuwiki_version')
-  let g:nuwiki_version = '0.1.0'
+  let g:nuwiki_version = '0.2.0'
 endif
 
 " Resolve the plugin root NOW, while this script is being sourced and