fix(parity): close the 2026-06-02 re-audit config/command findings

Implements the remaining fourth-pass findings (gap doc updated):

- list_margin: rework to upstream's buffer-side meaning. Drop the
  nuwiki-only HTML em-margin (renderer field/method + render_page_html
  param removed) and prepend max(0, list_margin) leading spaces to every
  generated bullet in build_toc_text / build_links_text /
  build_tag_links_text / diary::build_index_body; headings stay at col 0.
  From<RawWiki> derives 0 for markdown wikis when unset. Negatives can't
  resolve 'shiftwidth' server-side, so they collapse to zero indent
  (documented divergence).

- diary_months: per-wiki Vec<String> (default 12 English names), threaded
  into the diary-index month labels; missing/empty slots fall back to the
  English name.

- diary_caption_level: widen u8 -> i8 so vimwiki's -1 (min: -1) parses;
  build_index_body clamps < 0 to base tree level 0.

- VimwikiRemoveDone: regain upstream's -range. All four defs are now
  -bang -range, dispatched via remove_done(bang, range, l1, l2) in both
  clients: ! -> whole buffer, explicit range -> new list_remove_done_range
  ({range:[l1-1,l2-1]}), else current list. Server remove_done_edit gained
  an Option<(u32,u32)> range that filters whole-doc victims by start line.

markdown_header_style is deferred: the generators emit vimwiki syntax only
(caption_line never writes markdown headers), so there's no markdown header
to attach the style to. Logged as the "generated-content is vimwiki-only"
intentional divergence pending a later markdown generated-content effort.

Tests: list_margin indent, markdown list_margin-0 default, diary_months
custom + fallback, negative caption_level clamp/parse, ranged remove-done
(server + both keymap harnesses). 553 lsp/core tests pass; clippy clean.

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

crates/nuwiki-lsp/src/config.rs

@@ -49,13 +49,21 @@ pub struct WikiConfig {
     /// Weekday the diary week begins on (`monday`..`sunday`, vimwiki's
     /// `diary_start_week_day`). Used only when `diary_weekly_style = date`.
     pub diary_start_week_day: String,
-    /// Caption level for the diary index page headings (1 = h1).
-    pub diary_caption_level: u8,
+    /// Caption level for the diary index page headings (1 = h1). vimwiki's
+    /// `diary_caption_level` (`min: -1`). nuwiki uses it as the base level of
+    /// the year/month index tree; values `< 0` clamp to `0` (upstream's `-1`
+    /// "read no per-page captions" mode isn't modelled — nuwiki builds the
+    /// tree from dates, not page headers).
+    pub diary_caption_level: i8,
     /// Newest-first (`desc`) or oldest-first (`asc`) in the diary
     /// index.
     pub diary_sort: String,
     /// H1 text for the diary index page.
     pub diary_header: String,
+    /// vimwiki `diary_months`: month-number → display name for the diary
+    /// index tree. Twelve entries (January..December) by default; a custom
+    /// list falls back to the English name for any missing/out-of-range slot.
+    pub diary_months: Vec<String>,
     /// Vimwiki's `g:vimwiki_listsyms`. A progression of checkbox glyphs
     /// from "empty" (first) to "done" (last); the lexer recognises these
     /// glyphs and the toggle/cycle commands walk them. Any length ≥ 2 is
@@ -66,8 +74,12 @@ pub struct WikiConfig {
     pub listsym_rejected: String,
     /// When toggling a parent list item, also cascade to descendants.
     pub listsyms_propagate: bool,
-    /// `-1` keeps tight lists; positive integers indent list items by
-    /// that many extra columns. Layout hint for the renderer.
+    /// vimwiki `list_margin`: number of leading spaces before bullets in
+    /// **buffer-side generated lists** — `:VimwikiGenerateLinks`, the TOC, the
+    /// tags index, and the diary index. `>= 0` indents by that many spaces;
+    /// `< 0` means "no margin" (default `-1`; `0` for markdown wikis).
+    /// Divergence: upstream resolves `< 0` to the buffer's `'shiftwidth'`,
+    /// which the server can't observe, so negatives collapse to zero indent.
     pub list_margin: i32,
     /// Character used in place of literal spaces inside wikilink
     /// targets when writing to disk (a single space `" "` by default,
@@ -229,6 +241,7 @@ impl WikiConfig {
             diary_caption_level: d.diary_caption_level,
             diary_sort: d.diary_sort,
             diary_header: d.diary_header,
+            diary_months: d.diary_months,
             listsyms: d.listsyms,
             listsym_rejected: d.listsym_rejected,
             listsyms_propagate: d.listsyms_propagate,
@@ -268,6 +281,7 @@ impl WikiConfig {
             diary_caption_level: d.diary_caption_level,
             diary_sort: d.diary_sort,
             diary_header: d.diary_header,
+            diary_months: d.diary_months,
             listsyms: d.listsyms,
             listsym_rejected: d.listsym_rejected,
             listsyms_propagate: d.listsyms_propagate,
@@ -371,6 +385,27 @@ fn default_diary_header() -> String {
     "Diary".to_string()
 }
 
+/// vimwiki's default `diary_months` — the English month names, January..December.
+fn default_diary_months() -> Vec<String> {
+    [
+        "January",
+        "February",
+        "March",
+        "April",
+        "May",
+        "June",
+        "July",
+        "August",
+        "September",
+        "October",
+        "November",
+        "December",
+    ]
+    .iter()
+    .map(|s| s.to_string())
+    .collect()
+}
+
 fn default_listsyms() -> String {
     " .oOX".to_string()
 }
@@ -411,6 +446,7 @@ fn wiki_defaults() -> WikiDefaults {
         diary_caption_level: 0,
         diary_sort: default_diary_sort(),
         diary_header: default_diary_header(),
+        diary_months: default_diary_months(),
         listsyms: default_listsyms(),
         listsym_rejected: default_listsym_rejected(),
         listsyms_propagate: true,
@@ -436,9 +472,10 @@ struct WikiDefaults {
     diary_frequency: String,
     diary_weekly_style: String,
     diary_start_week_day: String,
-    diary_caption_level: u8,
+    diary_caption_level: i8,
     diary_sort: String,
     diary_header: String,
+    diary_months: Vec<String>,
     listsyms: String,
     listsym_rejected: String,
     listsyms_propagate: bool,
@@ -673,12 +710,14 @@ struct RawWiki {
     #[serde(default)]
     diary_start_week_day: Option<String>,
     #[serde(default)]
-    diary_caption_level: Option<u8>,
+    diary_caption_level: Option<i8>,
     #[serde(default)]
     diary_sort: Option<String>,
     #[serde(default)]
     diary_header: Option<String>,
     #[serde(default)]
+    diary_months: Option<Vec<String>>,
+    #[serde(default)]
     listsyms: Option<String>,
     #[serde(default)]
     listsym_rejected: Option<String>,
@@ -764,11 +803,19 @@ impl From<RawWiki> for WikiConfig {
             html.html_header_numbering_sym = s;
         }
         let d = wiki_defaults();
+        let syntax = r.syntax.unwrap_or_else(|| "vimwiki".into());
+        // vimwiki derives `list_margin = 0` for markdown wikis when the key is
+        // unset (vars.vim:651); other syntaxes keep the `-1` default.
+        let list_margin = r.list_margin.unwrap_or(if syntax == "markdown" {
+            0
+        } else {
+            d.list_margin
+        });
         WikiConfig {
             name: r.name.unwrap_or(derived_name),
             root,
             file_extension: r.file_extension.unwrap_or_else(|| ".wiki".into()),
-            syntax: r.syntax.unwrap_or_else(|| "vimwiki".into()),
+            syntax,
             index: r.index.unwrap_or(d.index),
             diary_rel_path: r.diary_rel_path.unwrap_or(d.diary_rel_path),
             diary_index: r.diary_index.unwrap_or(d.diary_index),
@@ -778,10 +825,11 @@ impl From<RawWiki> for WikiConfig {
             diary_caption_level: r.diary_caption_level.unwrap_or(d.diary_caption_level),
             diary_sort: r.diary_sort.unwrap_or(d.diary_sort),
             diary_header: r.diary_header.unwrap_or(d.diary_header),
+            diary_months: r.diary_months.unwrap_or(d.diary_months),
             listsyms: r.listsyms.unwrap_or(d.listsyms),
             listsym_rejected: r.listsym_rejected.unwrap_or(d.listsym_rejected),
             listsyms_propagate: r.listsyms_propagate.unwrap_or(d.listsyms_propagate),
-            list_margin: r.list_margin.unwrap_or(d.list_margin),
+            list_margin,
             links_space_char: r.links_space_char.unwrap_or(d.links_space_char),
             auto_toc: r.auto_toc.unwrap_or(d.auto_toc),
             auto_generate_links: r.auto_generate_links.unwrap_or(d.auto_generate_links),