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/diary.rs

@@ -274,7 +274,15 @@ fn build_index_body_is_newest_first_grouped_by_year_month() {
         &["2025-12-31", "2026-05-11", "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,
+    );
     let lines: Vec<&str> = body.lines().collect();
     assert_eq!(lines[0], "= Diary =");
     // First date in output should be the latest: 2026-05-12
@@ -292,7 +300,7 @@ fn build_index_body_is_newest_first_grouped_by_year_month() {
 
 #[test]
 fn build_index_body_empty_when_no_entries() {
-    let body = diary::build_index_body(&[], "diary", "Diary", diary::DiarySort::Desc, 1);
+    let body = diary::build_index_body(&[], "diary", "Diary", diary::DiarySort::Desc, 1, &[], 0);
     assert_eq!(body, "= Diary =\n");
 }
 
@@ -300,7 +308,8 @@ fn build_index_body_empty_when_no_entries() {
 fn build_index_body_ascending_sort_lists_oldest_first() {
     let idx = build_index_with_entries("/tmp/diarySort", &["2026-05-11", "2026-05-12"]);
     let entries = diary::list_entries(&idx);
-    let body = diary::build_index_body(&entries, "diary", "Diary", diary::DiarySort::Asc, 1);
+    let body =
+        diary::build_index_body(&entries, "diary", "Diary", diary::DiarySort::Asc, 1, &[], 0);
     let older = body.find("2026-05-11").unwrap();
     let newer = body.find("2026-05-12").unwrap();
     assert!(older < newer, "ascending sort lists oldest first");
@@ -310,7 +319,15 @@ fn build_index_body_ascending_sort_lists_oldest_first() {
 fn build_index_body_caption_level_shifts_all_headings() {
     let idx = build_index_with_entries("/tmp/diaryCap", &["2026-05-11"]);
     let entries = diary::list_entries(&idx);
-    let body = diary::build_index_body(&entries, "diary", "Diary", diary::DiarySort::Desc, 2);
+    let body = diary::build_index_body(
+        &entries,
+        "diary",
+        "Diary",
+        diary::DiarySort::Desc,
+        2,
+        &[],
+        0,
+    );
     assert!(body.contains("== Diary =="), "caption at level 2");
     assert!(
         body.contains("=== 2026 ==="),
@@ -327,11 +344,102 @@ fn build_index_body_clamps_caption_level_to_six() {
     let idx = build_index_with_entries("/tmp/diaryClamp", &["2026-05-11"]);
     let entries = diary::list_entries(&idx);
     // caption_level 6 → year/month would be 7/8 but clamp to 6.
-    let body = diary::build_index_body(&entries, "diary", "Diary", diary::DiarySort::Desc, 6);
+    let body = diary::build_index_body(
+        &entries,
+        "diary",
+        "Diary",
+        diary::DiarySort::Desc,
+        6,
+        &[],
+        0,
+    );
     assert!(body.contains("====== Diary ======"));
     assert!(!body.contains("======="), "no heading exceeds level 6");
 }
 
+#[test]
+fn build_index_body_uses_custom_diary_months() {
+    let idx = build_index_with_entries("/tmp/diaryMonths", &["2026-05-11", "2026-12-01"]);
+    let entries = diary::list_entries(&idx);
+    // A localized month table (Portuguese) replaces the English labels.
+    let months: Vec<String> = [
+        "Janeiro",
+        "Fevereiro",
+        "Março",
+        "Abril",
+        "Maio",
+        "Junho",
+        "Julho",
+        "Agosto",
+        "Setembro",
+        "Outubro",
+        "Novembro",
+        "Dezembro",
+    ]
+    .iter()
+    .map(|s| s.to_string())
+    .collect();
+    let body = diary::build_index_body(
+        &entries,
+        "diary",
+        "Diary",
+        diary::DiarySort::Desc,
+        1,
+        &months,
+        0,
+    );
+    assert!(body.contains("=== Maio ==="), "May → Maio: {body}");
+    assert!(
+        body.contains("=== Dezembro ==="),
+        "December → Dezembro: {body}"
+    );
+    assert!(!body.contains("May"), "English label leaked: {body}");
+}
+
+#[test]
+fn build_index_body_falls_back_per_missing_month_slot() {
+    let idx = build_index_with_entries("/tmp/diaryShort", &["2026-05-11"]);
+    let entries = diary::list_entries(&idx);
+    // A too-short table only covers Jan–Mar; May falls back to English.
+    let months: Vec<String> = ["Jan", "Feb", "Mar"]
+        .iter()
+        .map(|s| s.to_string())
+        .collect();
+    let body = diary::build_index_body(
+        &entries,
+        "diary",
+        "Diary",
+        diary::DiarySort::Desc,
+        1,
+        &months,
+        0,
+    );
+    assert!(
+        body.contains("=== May ==="),
+        "missing slot → English: {body}"
+    );
+}
+
+#[test]
+fn build_index_body_clamps_negative_caption_level_to_zero() {
+    let idx = build_index_with_entries("/tmp/diaryNeg", &["2026-05-11"]);
+    let entries = diary::list_entries(&idx);
+    // vimwiki allows diary_caption_level = -1; nuwiki clamps it to 0 (same as
+    // a caption_level of 0: caption h1, year h1, month h2).
+    let body = diary::build_index_body(
+        &entries,
+        "diary",
+        "Diary",
+        diary::DiarySort::Desc,
+        -1,
+        &[],
+        0,
+    );
+    assert!(body.contains("= Diary ="), "caption at level 1: {body}");
+    assert!(body.contains("= 2026 ="), "year at level 1: {body}");
+    assert!(body.contains("== May =="), "month at level 2: {body}");
+}
+
 #[test]
 fn render_index_body_round_trip() {
     let cfg = wiki_cfg("/tmp/diaryA");