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/tests/commands_coverage.rs

@@ -262,7 +262,15 @@ fn nuwiki_diary_index_resolves_index_uri() {
 fn nuwiki_diary_generate_links_builds_grouped_body() {
     let idx = diary_index("/wiki", &["2026-05-10", "2026-05-12", "2026-04-30"]);
     let entries = diary::list_entries(&idx);
-    let body = diary::build_index_body(&entries, "diary", "Diary", diary::DiarySort::Desc, 1);
+    let body = diary::build_index_body(
+        &entries,
+        "diary",
+        "Diary",
+        diary::DiarySort::Desc,
+        1,
+        &[],
+        0,
+    );
     assert!(body.starts_with("= Diary ="));
     assert!(body.contains("2026-05-12"));
     assert!(body.contains("2026-05-10"));
@@ -298,7 +306,7 @@ fn nuwiki_toc_generates_nested_contents() {
     let src = "= Top =\n== Sub ==\ntext\n";
     let doc = parse(src);
     let uri = Url::from_file_path("/wiki/Page.wiki").unwrap();
-    let edit = ops::toc_edit(src, &doc, &uri, true, "Contents", 1).expect("toc edit produced");
+    let edit = ops::toc_edit(src, &doc, &uri, true, "Contents", 1, 0).expect("toc edit produced");
     assert!(edit.changes.is_some() || edit.document_changes.is_some());
 
     let toc = ops::build_toc_text(
@@ -308,6 +316,7 @@ fn nuwiki_toc_generates_nested_contents() {
         ],
         "Contents",
         1,
+        0,
     );
     assert!(toc.contains("= Contents ="));
     assert!(toc.contains("- [[#top|Top]]"));
@@ -318,7 +327,7 @@ fn nuwiki_toc_generates_nested_contents() {
 #[test]
 fn nuwiki_generate_links_lists_all_pages_excluding_current() {
     let pages = vec!["About".to_string(), "Home".to_string(), "Notes".to_string()];
-    let text = ops::build_links_text(&pages, "Links", 1, Some("Home"));
+    let text = ops::build_links_text(&pages, "Links", 1, Some("Home"), 0);
     assert!(text.contains("= Links ="));
     assert!(text.contains("- [[About]]"));
     assert!(text.contains("- [[Notes]]"));
@@ -327,7 +336,18 @@ fn nuwiki_generate_links_lists_all_pages_excluding_current() {
     let src = "= Existing =\n";
     let doc = parse(src);
     let uri = Url::from_file_path("/wiki/Home.wiki").unwrap();
-    assert!(ops::links_edit(src, &doc, &uri, "Home", &pages, true, "Generated Links", 1).is_some());
+    assert!(ops::links_edit(
+        src,
+        &doc,
+        &uri,
+        "Home",
+        &pages,
+        true,
+        "Generated Links",
+        1,
+        0
+    )
+    .is_some());
 }
 
 // :NuwikiCheckLinks — surface broken links across the workspace.
@@ -384,13 +404,13 @@ fn nuwiki_generate_tag_links_builds_section() {
     );
     let by_tag = ops::tag_pages_snapshot(&idx);
 
-    let single = ops::build_tag_links_text(&by_tag, Some("alpha"), "Generated Tags", 1).unwrap();
+    let single = ops::build_tag_links_text(&by_tag, Some("alpha"), "Generated Tags", 1, 0).unwrap();
     assert!(single.starts_with("= Tag: alpha ="));
     assert!(single.contains("- [[Home]]"));
     assert!(single.contains("- [[Work]]"));
 
     // No-arg variant emits a section per tag.
-    let all = ops::build_tag_links_text(&by_tag, None, "Generated Tags", 1).unwrap();
+    let all = ops::build_tag_links_text(&by_tag, None, "Generated Tags", 1, 0).unwrap();
     assert!(all.starts_with("= Generated Tags ="));
     assert!(all.contains("== alpha =="));
     assert!(all.contains("== beta =="));
@@ -406,7 +426,8 @@ fn nuwiki_generate_tag_links_builds_section() {
         &by_tag,
         true,
         "Generated Tags",
-        1
+        1,
+        0
     )
     .is_some());
 }
@@ -442,7 +463,6 @@ fn nuwiki_2html_renders_page() {
         DiaryDate::from_ymd(2026, 5, 12).unwrap(),
         &cfg.html,
         Some(".wiki"),
-        -1,
         HashMap::new(),
     )
     .unwrap();
@@ -464,7 +484,6 @@ fn nuwiki_2html_browse_shares_render_and_is_advertised() {
         DiaryDate::today_utc(),
         &cfg.html,
         Some(".wiki"),
-        -1,
         HashMap::new(),
     )
     .unwrap();