phase 19: editor glue v2

Server-side:
- New `folding.rs` module with `folding_ranges(ast, total_lines)`.
  Emits one fold per top-level heading (start → line before the
  next same-or-higher-level heading, or EOF) plus one per top-level
  list block. Nested headings fold inside their parent thanks to the
  level-aware end-line computation; sublists fold implicitly via
  their parent item's source span. `FoldingRangeKind::Region` is set
  on every fold so collapsing UIs render them as section folds.
- `Backend::folding_range` handler wires the module into
  `textDocument/foldingRange`; `ServerCapabilities.folding_range_provider`
  advertises it.
- `folding::line_count` exposed for the handler and tests; treats a
  trailing newline as a virtual empty line (the line LSP positions
  use for EOF).

Editor glue (Neovim primary, Vim minimal):
- `lua/nuwiki/commands.lua` — async `workspace/executeCommand`
  wrappers for every server command shipped through Phase 18. The
  open-* family handles `{ uri }` responses by opening the file
  (with `tab` / `split` variants). `check_links` and `find_orphans`
  hand results to `setqflist` + `:copen` for quickfix-style review.
  §13.1-deferred commands (`list.changeSymbol`, table rewriters,
  `link.pasteWikilink/pasteUrl`, `colorize`) stub out with
  `vim.notify` so users get a clear "not yet implemented" signal
  instead of an LSP "unknown command" error.
- `lua/nuwiki/keymaps.lua` — buffer-local default mappings. Subgroups
  (`list_editing`, `header_nav`, `diary`, `html_export`,
  `text_objects`) flip independently via the new
  `mappings.<group>` config. Heading promote/demote uses `g=`/`g-`
  to avoid clobbering Vim's built-in `=`/`-` operators.
- `lua/nuwiki/textobjects.lua` — `ah`/`ih` (around/inside heading)
  using a buffer scan for the heading-block boundary. The four
  remaining text objects from SPEC §12.10 wait until §13.1 lands
  the table/list rewriters they share infrastructure with.
- `lua/nuwiki/folding.lua` — pure regex `foldexpr` + `foldtext`
  fallback for clients without `foldingRange`. Same heading-block
  model as the server.
- `lua/nuwiki/ftplugin.lua` — single per-buffer attach entry point.
  `folding = 'lsp'` (default) uses Neovim 0.11+'s `vim.lsp.foldexpr`,
  falling back to the regex on older versions; `'expr'` forces the
  fallback; `'off'` skips folding setup.
- `lua/nuwiki/config.lua` — extends defaults with `mappings = {...}`
  (P10 keymap layer) and `folding` (P14 resolved).
- `ftplugin/nuwiki.vim` — declares every `:Vimwiki*` / `:Nuwiki*`
  command from SPEC §12.10 by inlining `lua require(...).fn()`
  bodies (no script-local function indirection so commands stay
  callable after re-source). Plain-Vim users get only the buffer
  options; they're expected to drive the LSP via vim-lsp / coc's
  built-in commands.

Health check (§12.10 additions):
- `:checkhealth nuwiki` now reports the count of `executeCommand`
  entries the server advertises, whether `foldingRange` capability
  was negotiated, and whether the configured HTML output directory
  exists + is writable. Default keymap subgroup status is also
  surfaced.

Tests: 8 new in `phase19_folding.rs` covering empty docs, single
heading → EOF, sibling headings each getting their own fold,
nested heading bounded by parent, top-level list folds, single-line
heading non-fold, fold-kind classification, and `line_count`
semantics. Total 377 tests pass; fmt + clippy clean.

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

README.md

@@ -41,7 +41,7 @@ See [`SPEC.md`](./SPEC.md) for the full project specification.
 | 16 | Diary | ✅ done |
 | 17 | HTML export commands | ✅ done |
 | 18 | Multi-wiki | ✅ done |
-| 19 | Editor glue v2 (`:Vimwiki*` compat, keymaps, text objects, folding) | ⏳ |
+| 19 | Editor glue v2 (`:Vimwiki*` compat, keymaps, text objects, folding) | ✅ done |
 
 ## Repository layout
 

SPEC.md

@@ -1382,14 +1382,12 @@ Deferred because the value proposition over the existing
 `workspace/rename` flow is marginal and the editor-side support is
 inconsistent across clients.
 
-### 13.3 v1.1 phase 19
+### 13.3 v1.1 status
 
-Tracked in §10 with status `⏳`. Not "missing" from earlier phases —
-it's future work in the v1.1 roadmap:
-
-- **Phase 19** — Editor glue v2: `:Vimwiki*` compat layer, default
-  keymaps, text objects, folding (P14 already resolved in favour of
-  LSP `foldingRange` + `foldexpr` fallback).
+All numbered phases through 19 are shipped. The remaining work is
+the §13.1 deferred Phase 14 command surface (table/list rewriters,
+link helpers, colorize) and the small follow-ups noted under §13.2 /
+§13.4.
 
 Earlier v1.1 phases now shipped:
 
@@ -1409,6 +1407,21 @@ Earlier v1.1 phases now shipped:
   picker commands: `nuwiki.wiki.listAll`, `nuwiki.wiki.select`,
   `nuwiki.wiki.openIndex`, `nuwiki.wiki.tabOpenIndex`, plus
   `nuwiki.wiki.gotoPage` for the `:VimwikiGoto` compat surface.
+- Phase 19 (editor glue v2) — LSP `textDocument/foldingRange`
+  provider (`folding::folding_ranges`) with heading-block + top-level
+  list semantics; advertised via `folding_range_provider`. A pure
+  Lua `foldexpr` fallback ships in `lua/nuwiki/folding.lua` for
+  clients without `foldingRange` support. `ftplugin/nuwiki.vim`
+  defines the full `:Vimwiki*` compat surface plus `:Nuwiki*`
+  aliases — every command that maps to a server-side `executeCommand`
+  is wired; §13.1-deferred commands stub out with a "not yet
+  implemented" notification so users get a clear signal. Default
+  buffer-local keymaps cover the working subset (checkbox toggle,
+  next task, heading promote/demote via `g=`/`g-`, diary navigation
+  via `<C-Up>`/`<C-Down>`, HTML export under `<Leader>wh*`). A
+  heading text object (`ah`/`ih`) ships now; `aH`/`iH`/`a\`/`i\`/
+  `ac`/`ic`/`al`/`il` land once the §13.1 table/list rewriters
+  arrive.
 
 ### 13.4 §9 syntax checklist status
 

crates/nuwiki-lsp/src/folding.rs

@@ -0,0 +1,88 @@
+//! `textDocument/foldingRange` provider — SPEC §12.10 / P14.
+//!
+//! Strategy: one fold per heading (line → line before the next heading
+//! of same-or-higher level) plus one fold per top-level list block.
+//! Folding is deliberately conservative — we never produce nested folds
+//! beyond what the AST already groups, since vimwiki users mostly want
+//! "collapse this section" behaviour rather than fine-grained code-fold
+//! semantics.
+
+use nuwiki_core::ast::{BlockNode, DocumentNode};
+use tower_lsp::lsp_types::{FoldingRange, FoldingRangeKind};
+
+/// Compute folding ranges for the whole document. `total_lines` is the
+/// number of lines in the source (`text.lines().count() as u32`) — used
+/// to extend the last heading's fold to end-of-document.
+pub fn folding_ranges(ast: &DocumentNode, total_lines: u32) -> Vec<FoldingRange> {
+    let mut out = Vec::new();
+    let last_line = total_lines.saturating_sub(1);
+
+    // Collect heading spans + levels in source order. We walk the
+    // top-level children only — nested headings inside blockquotes are
+    // rare and folding them adds complexity for little gain.
+    let mut headings: Vec<(u32, u8)> = Vec::new();
+    for block in &ast.children {
+        if let BlockNode::Heading(h) = block {
+            headings.push((h.span.start.line, h.level));
+        }
+    }
+    // For each heading, end-line is one before the next heading whose
+    // level is <= current level (or last_line otherwise).
+    for (i, &(line, level)) in headings.iter().enumerate() {
+        let end = headings[i + 1..]
+            .iter()
+            .find(|(_, l)| *l <= level)
+            .map(|(next_line, _)| next_line.saturating_sub(1))
+            .unwrap_or(last_line);
+        if end > line {
+            out.push(FoldingRange {
+                start_line: line,
+                end_line: end,
+                start_character: None,
+                end_character: None,
+                kind: Some(FoldingRangeKind::Region),
+                collapsed_text: None,
+            });
+        }
+    }
+
+    // Fold each top-level list. Sublists fold implicitly because their
+    // parent item's source span already covers them.
+    for block in &ast.children {
+        if let BlockNode::List(l) = block {
+            let start = l.span.start.line;
+            let end = l.span.end.line;
+            if end > start {
+                out.push(FoldingRange {
+                    start_line: start,
+                    end_line: end,
+                    start_character: None,
+                    end_character: None,
+                    kind: Some(FoldingRangeKind::Region),
+                    collapsed_text: None,
+                });
+            }
+        }
+    }
+
+    out
+}
+
+/// Count lines in `text` (always ≥ 1 for non-empty input).
+pub fn line_count(text: &str) -> u32 {
+    if text.is_empty() {
+        0
+    } else {
+        let mut n = text.bytes().filter(|b| *b == b'\n').count() as u32;
+        if !text.ends_with('\n') {
+            n += 1;
+        } else {
+            // trailing newline still bounds a virtual line; LSP positions
+            // index 0-based, so the file ends at line `n` (the empty one
+            // after the final newline). We treat "lines" as the count
+            // *including* that trailing empty line for fold-end clamping.
+            n += 1;
+        }
+        n
+    }
+}

crates/nuwiki-lsp/src/lib.rs

@@ -27,6 +27,7 @@ pub mod diagnostics;
 pub mod diary;
 pub mod edits;
 pub mod export;
+pub mod folding;
 pub mod index;
 pub mod nav;
 pub mod rename;
@@ -47,11 +48,12 @@ use tower_lsp::lsp_types::{
     DidChangeTextDocumentParams, DidCloseTextDocumentParams, DidOpenTextDocumentParams,
     DidSaveTextDocumentParams, DocumentSymbol, DocumentSymbolParams, DocumentSymbolResponse,
     ExecuteCommandOptions, ExecuteCommandParams, FileOperationFilter, FileOperationPattern,
-    FileOperationPatternKind, FileOperationRegistrationOptions, GotoDefinitionParams,
-    GotoDefinitionResponse, Hover, HoverContents, HoverParams, HoverProviderCapability,
-    InitializeParams, InitializeResult, InitializedParams, Location, MarkupContent, MarkupKind,
-    MessageType, OneOf, PositionEncodingKind, ProgressParams, ProgressParamsValue, ProgressToken,
-    Range, ReferenceParams, RenameFilesParams, RenameParams, SaveOptions, SemanticTokens,
+    FileOperationPatternKind, FileOperationRegistrationOptions, FoldingRange, FoldingRangeParams,
+    FoldingRangeProviderCapability, GotoDefinitionParams, GotoDefinitionResponse, Hover,
+    HoverContents, HoverParams, HoverProviderCapability, InitializeParams, InitializeResult,
+    InitializedParams, Location, MarkupContent, MarkupKind, MessageType, OneOf,
+    PositionEncodingKind, ProgressParams, ProgressParamsValue, ProgressToken, Range,
+    ReferenceParams, RenameFilesParams, RenameParams, SaveOptions, SemanticTokens,
     SemanticTokensFullOptions, SemanticTokensOptions, SemanticTokensParams,
     SemanticTokensRangeParams, SemanticTokensRangeResult, SemanticTokensResult,
     SemanticTokensServerCapabilities, ServerCapabilities, ServerInfo,
@@ -408,6 +410,7 @@ impl LanguageServer for Backend {
                     workspace_folders: None,
                     file_operations: Some(wiki_file_operations()),
                 }),
+                folding_range_provider: Some(FoldingRangeProviderCapability::Simple(true)),
                 ..ServerCapabilities::default()
             },
             server_info: Some(ServerInfo {
@@ -839,6 +842,18 @@ impl LanguageServer for Backend {
         }
     }
 
+    async fn folding_range(
+        &self,
+        params: FoldingRangeParams,
+    ) -> LspResult<Option<Vec<FoldingRange>>> {
+        let uri = &params.text_document.uri;
+        let Some(doc) = self.documents.get(uri) else {
+            return Ok(None);
+        };
+        let total = folding::line_count(&doc.text);
+        Ok(Some(folding::folding_ranges(&doc.ast, total)))
+    }
+
     async fn symbol(
         &self,
         params: WorkspaceSymbolParams,

crates/nuwiki-lsp/tests/phase19_folding.rs

@@ -0,0 +1,111 @@
+//! Phase 19: LSP folding-range provider.
+//!
+//! Drives `folding::folding_ranges` directly. The handler wiring is
+//! shallow — it just calls into this function — so we verify the
+//! shapes here and trust the integration via the LSP test harness in
+//! `lsp_helpers.rs`.
+
+use nuwiki_core::syntax::vimwiki::VimwikiSyntax;
+use nuwiki_core::syntax::SyntaxPlugin;
+use nuwiki_lsp::folding;
+
+fn parse(src: &str) -> nuwiki_core::ast::DocumentNode {
+    VimwikiSyntax::new().parse(src)
+}
+
+#[test]
+fn no_headings_no_lists_emits_no_folds() {
+    let src = "just text\non two lines\n";
+    let ast = parse(src);
+    let folds = folding::folding_ranges(&ast, folding::line_count(src));
+    assert!(folds.is_empty());
+}
+
+#[test]
+fn single_heading_folds_to_end_of_document() {
+    let src = "= Title =\nbody line 1\nbody line 2\n";
+    let ast = parse(src);
+    let folds = folding::folding_ranges(&ast, folding::line_count(src));
+    assert_eq!(folds.len(), 1);
+    assert_eq!(folds[0].start_line, 0);
+    // body line 2 is line 2; trailing newline pushes line_count to 4 so
+    // last_line == 3 (the empty line after the final newline).
+    assert!(folds[0].end_line >= 2);
+}
+
+#[test]
+fn sibling_headings_each_get_their_own_fold() {
+    let src = "= One =\nbody\n= Two =\nbody2\n= Three =\n";
+    let ast = parse(src);
+    let folds = folding::folding_ranges(&ast, folding::line_count(src));
+    let heading_folds: Vec<_> = folds
+        .iter()
+        .filter(|f| f.start_line == 0 || f.start_line == 2 || f.start_line == 4)
+        .collect();
+    assert_eq!(heading_folds.len(), 3, "got: {folds:?}");
+    // One closes before Two
+    assert_eq!(heading_folds[0].end_line, 1);
+    // Two closes before Three
+    assert_eq!(heading_folds[1].end_line, 3);
+}
+
+#[test]
+fn nested_heading_folds_inside_parent() {
+    let src = "= Outer =\nintro\n== Inner ==\nbody\n= Other =\n";
+    let ast = parse(src);
+    let folds = folding::folding_ranges(&ast, folding::line_count(src));
+    // Outer fold spans up to the line before `= Other =` (line 4).
+    let outer = folds
+        .iter()
+        .find(|f| f.start_line == 0)
+        .expect("outer fold");
+    assert_eq!(outer.end_line, 3);
+    // Inner fold is bounded by the next h1 too (since the only following
+    // heading is h1, which has level <= 2).
+    let inner = folds
+        .iter()
+        .find(|f| f.start_line == 2)
+        .expect("inner fold");
+    assert_eq!(inner.end_line, 3);
+}
+
+#[test]
+fn top_level_list_gets_its_own_fold() {
+    let src = "before\n- item one\n- item two\n- item three\nafter\n";
+    let ast = parse(src);
+    let folds = folding::folding_ranges(&ast, folding::line_count(src));
+    let list_fold = folds.iter().find(|f| f.start_line == 1);
+    assert!(list_fold.is_some(), "expected a list fold: {folds:?}");
+}
+
+#[test]
+fn single_line_blocks_are_not_folded() {
+    let src = "= Solo =\n";
+    let ast = parse(src);
+    let folds = folding::folding_ranges(&ast, folding::line_count(src));
+    // A heading on the only line of the document covers nothing
+    // foldable, so it's omitted.
+    let none_for_solo = folds
+        .iter()
+        .all(|f| !(f.start_line == 0 && f.end_line == 0));
+    assert!(none_for_solo, "got: {folds:?}");
+}
+
+#[test]
+fn fold_kind_is_region() {
+    use tower_lsp::lsp_types::FoldingRangeKind;
+    let src = "= H =\nbody\n";
+    let ast = parse(src);
+    let folds = folding::folding_ranges(&ast, folding::line_count(src));
+    assert!(!folds.is_empty());
+    assert_eq!(folds[0].kind, Some(FoldingRangeKind::Region));
+}
+
+#[test]
+fn line_count_matches_intuitive_definition() {
+    assert_eq!(folding::line_count(""), 0);
+    assert_eq!(folding::line_count("one"), 1);
+    assert_eq!(folding::line_count("one\n"), 2); // trailing newline → virtual empty line
+    assert_eq!(folding::line_count("one\ntwo"), 2);
+    assert_eq!(folding::line_count("one\ntwo\n"), 3);
+}

ftplugin/nuwiki.vim

@@ -1,8 +1,12 @@
-" ftplugin/nuwiki.vim — per-buffer settings for `.wiki` buffers.
+" ftplugin/nuwiki.vim — per-buffer settings + Phase 19 command/keymap glue.
 "
-" Keeps this minimal: only the options that affect editing ergonomics for
-" markup files. Anything richer (folding, navigation keymaps, …) ships
-" downstream once users opt in.
+" Wires up:
+"   - basic edit-time options (commentstring, suffixesadd, …)
+"   - every `:Vimwiki*` / `:Nuwiki*` command from SPEC §12.10 that has a
+"     server-side counterpart (deferred §13.1 commands stub out with a
+"     "not yet implemented" notification)
+"   - on Neovim: keymaps + text objects + folding via
+"     `nuwiki.ftplugin.attach()`
 
 if exists('b:did_ftplugin')
   finish
@@ -16,3 +20,104 @@ setlocal suffixesadd=.wiki
 setlocal iskeyword+=-
 
 let b:undo_ftplugin = 'setlocal commentstring< comments< formatoptions< suffixesadd< iskeyword<'
+
+if !has('nvim')
+  " Plain Vim — the buffer-local options above are all we ship. Vim users
+  " interact via the LSP client (vim-lsp / coc) which already exposes
+  " `:LspDefinition`, `:LspReferences`, `:LspRename`, etc.
+  finish
+endif
+
+" ===== Neovim path =====
+
+" :Vimwiki* compat — every command dispatches to a Lua wrapper in
+" `nuwiki.commands` that either issues a `workspace/executeCommand`
+" or, for client-side operations, calls `vim.lsp.buf.*` directly.
+
+command! -buffer -count VimwikiIndex      lua require('nuwiki.commands').wiki_index(vim.v.count)
+command! -buffer -count VimwikiTabIndex   lua require('nuwiki.commands').wiki_tab_index(vim.v.count)
+command! -buffer        VimwikiUISelect   lua require('nuwiki.commands').wiki_ui_select()
+command! -buffer        VimwikiDiaryIndex lua require('nuwiki.commands').diary_index()
+command! -buffer        VimwikiMakeDiaryNote          lua require('nuwiki.commands').diary_today()
+command! -buffer        VimwikiMakeYesterdayDiaryNote lua require('nuwiki.commands').diary_yesterday()
+command! -buffer        VimwikiMakeTomorrowDiaryNote  lua require('nuwiki.commands').diary_tomorrow()
+command! -buffer        VimwikiDiaryNextDay   lua require('nuwiki.commands').diary_next()
+command! -buffer        VimwikiDiaryPrevDay   lua require('nuwiki.commands').diary_prev()
+command! -buffer        VimwikiDiaryGenerateLinks lua require('nuwiki.commands').diary_generate_index()
+
+command! -buffer        VimwikiFollowLink  lua vim.lsp.buf.definition()
+command! -buffer        VimwikiGoBackLink  normal!
+command! -buffer        VimwikiSplitLink   split | lua vim.lsp.buf.definition()
+command! -buffer        VimwikiVSplitLink  vsplit | lua vim.lsp.buf.definition()
+command! -buffer        VimwikiTabnewLink  tabnew | lua vim.lsp.buf.definition()
+command! -buffer        VimwikiTabDropLink tabnew | lua vim.lsp.buf.definition()
+command! -buffer -nargs=1 VimwikiGoto       lua require('nuwiki.commands').wiki_goto_page(<q-args>)
+command! -buffer        VimwikiBacklinks   lua vim.lsp.buf.references()
+command! -buffer        VWB                lua vim.lsp.buf.references()
+command! -buffer -nargs=1 VimwikiSearch     lvimgrep /<args>/ **
+command! -buffer -nargs=1 VWS               lvimgrep /<args>/ **
+
+command! -buffer        VimwikiDeleteFile lua require('nuwiki.commands').delete_file()
+command! -buffer        VimwikiRenameFile lua require('nuwiki.commands').rename_file()
+
+command! -buffer        VimwikiNextTask              lua require('nuwiki.commands').next_task()
+command! -buffer        VimwikiToggleListItem        lua require('nuwiki.commands').toggle_list_item()
+command! -buffer        VimwikiToggleRejectedListItem lua require('nuwiki.commands').reject_list_item()
+command! -buffer        VimwikiRemoveDone            lua require('nuwiki.commands').list_remove_done()
+command! -buffer -nargs=? VimwikiListChangeLvl        lua require('nuwiki.commands').list_change_lvl()
+
+command! -buffer        Vimwiki2HTML       lua require('nuwiki.commands').export_current()
+command! -buffer        Vimwiki2HTMLBrowse lua require('nuwiki.commands').export_browse()
+command! -buffer -bang  VimwikiAll2HTML    execute (<bang>0 ? "lua require('nuwiki.commands').export_all_force()" : "lua require('nuwiki.commands').export_all()")
+command! -buffer        VimwikiRss         lua require('nuwiki.commands').export_rss()
+
+command! -buffer        VimwikiTOC               lua require('nuwiki.commands').toc_generate()
+command! -buffer        VimwikiGenerateLinks     lua require('nuwiki.commands').links_generate()
+command! -buffer        VimwikiCheckLinks        lua require('nuwiki.commands').check_links()
+command! -buffer        VimwikiFindOrphans       lua require('nuwiki.commands').find_orphans()
+
+command! -buffer        VimwikiRebuildTags       lua require('nuwiki.commands').tags_rebuild()
+command! -buffer -nargs=? VimwikiSearchTags        lua require('nuwiki.commands').tags_search(<q-args>)
+command! -buffer -nargs=? VimwikiGenerateTagLinks  lua require('nuwiki.commands').tags_generate_links(<q-args>)
+
+" §13.1 deferred — stubs notify the user instead of erroring.
+command! -buffer -nargs=1 VimwikiTable             lua require('nuwiki.commands').table_insert()
+command! -buffer        VimwikiTableMoveColumnLeft  lua require('nuwiki.commands').table_move_column_left()
+command! -buffer        VimwikiTableMoveColumnRight lua require('nuwiki.commands').table_move_column_right()
+command! -buffer -nargs=1 VimwikiColorize          lua require('nuwiki.commands').colorize()
+command! -buffer        VimwikiPasteLink           lua require('nuwiki.commands').paste_link()
+command! -buffer        VimwikiPasteUrl            lua require('nuwiki.commands').paste_url()
+
+" Canonical :Nuwiki* aliases — P10.
+command! -buffer -count NuwikiIndex      lua require('nuwiki.commands').wiki_index(vim.v.count)
+command! -buffer        NuwikiTabIndex   lua require('nuwiki.commands').wiki_tab_index(vim.v.count)
+command! -buffer        NuwikiUISelect   lua require('nuwiki.commands').wiki_ui_select()
+command! -buffer        NuwikiDiaryIndex lua require('nuwiki.commands').diary_index()
+command! -buffer        NuwikiDiaryToday     lua require('nuwiki.commands').diary_today()
+command! -buffer        NuwikiDiaryYesterday lua require('nuwiki.commands').diary_yesterday()
+command! -buffer        NuwikiDiaryTomorrow  lua require('nuwiki.commands').diary_tomorrow()
+command! -buffer        NuwikiDiaryNext      lua require('nuwiki.commands').diary_next()
+command! -buffer        NuwikiDiaryPrev      lua require('nuwiki.commands').diary_prev()
+command! -buffer        NuwikiDiaryGenerateLinks lua require('nuwiki.commands').diary_generate_index()
+command! -buffer        NuwikiFollowLink lua vim.lsp.buf.definition()
+command! -buffer        NuwikiBacklinks  lua vim.lsp.buf.references()
+command! -buffer        NuwikiDeleteFile lua require('nuwiki.commands').delete_file()
+command! -buffer        NuwikiRenameFile lua require('nuwiki.commands').rename_file()
+command! -buffer        NuwikiNextTask           lua require('nuwiki.commands').next_task()
+command! -buffer        NuwikiToggleListItem     lua require('nuwiki.commands').toggle_list_item()
+command! -buffer        NuwikiToggleRejected     lua require('nuwiki.commands').reject_list_item()
+command! -buffer        NuwikiExport             lua require('nuwiki.commands').export_current()
+command! -buffer        NuwikiExportBrowse       lua require('nuwiki.commands').export_browse()
+command! -buffer -bang  NuwikiExportAll          execute (<bang>0 ? "lua require('nuwiki.commands').export_all_force()" : "lua require('nuwiki.commands').export_all()")
+command! -buffer        NuwikiRss                lua require('nuwiki.commands').export_rss()
+command! -buffer        NuwikiTOC                lua require('nuwiki.commands').toc_generate()
+command! -buffer        NuwikiGenerateLinks      lua require('nuwiki.commands').links_generate()
+command! -buffer        NuwikiCheckLinks         lua require('nuwiki.commands').check_links()
+command! -buffer        NuwikiFindOrphans        lua require('nuwiki.commands').find_orphans()
+command! -buffer        NuwikiRebuildTags        lua require('nuwiki.commands').tags_rebuild()
+command! -buffer -nargs=? NuwikiSearchTags         lua require('nuwiki.commands').tags_search(<q-args>)
+command! -buffer -nargs=? NuwikiGenerateTagLinks   lua require('nuwiki.commands').tags_generate_links(<q-args>)
+command! -buffer -nargs=1 NuwikiGoto               lua require('nuwiki.commands').wiki_goto_page(<q-args>)
+
+" Phase 19 buffer attach: keymaps + text objects + folding.
+lua require('nuwiki.ftplugin').attach(0)

lua/nuwiki/commands.lua

@@ -0,0 +1,348 @@
+-- lua/nuwiki/commands.lua — Lua wrappers around every `nuwiki.*`
+-- `workspace/executeCommand` the server advertises. Phase 19 plumbing.
+--
+-- Each public function is named after its `:Vimwiki*` / `:Nuwiki*`
+-- counterpart so `ftplugin/nuwiki.vim` can wire them up declaratively.
+-- All requests run asynchronously; commands that return a `{ uri }`
+-- payload open the result in the current window (or a new tab, when
+-- the variant is `*_tab`).
+
+local M = {}
+
+local function buf_uri(bufnr)
+  return vim.uri_from_bufnr(bufnr or 0)
+end
+
+local function position_params()
+  return vim.lsp.util.make_position_params()
+end
+
+local function find_client()
+  local fn = vim.lsp.get_clients or vim.lsp.get_active_clients
+  local clients = fn({ name = 'nuwiki', bufnr = 0 })
+  if #clients == 0 then
+    -- Try without bufnr filter for workspace-level commands.
+    clients = fn({ name = 'nuwiki' })
+  end
+  return clients[1]
+end
+
+local function exec(command, arguments, on_result)
+  local client = find_client()
+  if not client then
+    vim.notify('nuwiki: language server not attached', vim.log.levels.ERROR)
+    return
+  end
+  client.request(
+    'workspace/executeCommand',
+    { command = command, arguments = arguments or {} },
+    function(err, result)
+      if err then
+        vim.notify(
+          'nuwiki: ' .. command .. ' — ' .. (err.message or vim.inspect(err)),
+          vim.log.levels.ERROR
+        )
+        return
+      end
+      if on_result then
+        on_result(result)
+      end
+    end,
+    vim.api.nvim_get_current_buf()
+  )
+end
+
+local function open_uri(uri, tab)
+  if not uri then
+    return
+  end
+  local path = vim.uri_to_fname(uri)
+  local cmd
+  if tab == 'split' then
+    cmd = 'split'
+  elseif tab == 'vsplit' then
+    cmd = 'vsplit'
+  elseif tab == true then
+    cmd = 'tabedit'
+  else
+    cmd = 'edit'
+  end
+  vim.cmd(cmd .. ' ' .. vim.fn.fnameescape(path))
+end
+
+local function pos_args()
+  return { vim.tbl_extend('force', { uri = buf_uri() }, position_params()) }
+end
+
+local function uri_args()
+  return { { uri = buf_uri() } }
+end
+
+-- ===== Wiki picker =====
+
+function M.wiki_index(count)
+  local args = { {} }
+  if count and count > 0 then
+    args = { { wiki = count - 1 } }  -- 1-indexed at the user level
+  end
+  exec('nuwiki.wiki.openIndex', args, function(r)
+    if r and r.uri then
+      open_uri(r.uri, r.tab)
+    end
+  end)
+end
+
+function M.wiki_tab_index(count)
+  local args = { {} }
+  if count and count > 0 then
+    args = { { wiki = count - 1 } }
+  end
+  exec('nuwiki.wiki.tabOpenIndex', args, function(r)
+    if r and r.uri then
+      open_uri(r.uri, true)
+    end
+  end)
+end
+
+function M.wiki_ui_select()
+  exec('nuwiki.wiki.select', { {} }, function(r)
+    if type(r) ~= 'table' or #r == 0 then
+      vim.notify('nuwiki: no wikis configured')
+      return
+    end
+    vim.ui.select(
+      r,
+      {
+        prompt = 'Pick a wiki',
+        format_item = function(w)
+          return string.format('%d. %s  (%s)', (w.id or 0) + 1, w.name or '?', tostring(w.root))
+        end,
+      },
+      function(choice)
+        if not choice then return end
+        exec(
+          'nuwiki.wiki.openIndex',
+          { { wiki = choice.id } },
+          function(rr) if rr and rr.uri then open_uri(rr.uri) end end
+        )
+      end
+    )
+  end)
+end
+
+function M.wiki_goto_page(name)
+  if not name or name == '' then
+    name = vim.fn.input('Goto page: ')
+    if name == '' then return end
+  end
+  exec('nuwiki.wiki.gotoPage', { { page = name } }, function(r)
+    if r and r.uri then open_uri(r.uri) end
+  end)
+end
+
+-- ===== Diary =====
+
+local function _diary_open(cmd_name)
+  return function()
+    exec(cmd_name, uri_args(), function(r)
+      if r and r.uri then open_uri(r.uri) end
+    end)
+  end
+end
+
+M.diary_today = _diary_open('nuwiki.diary.openToday')
+M.diary_yesterday = _diary_open('nuwiki.diary.openYesterday')
+M.diary_tomorrow = _diary_open('nuwiki.diary.openTomorrow')
+M.diary_index = _diary_open('nuwiki.diary.openIndex')
+
+function M.diary_next()
+  exec('nuwiki.diary.next', uri_args(), function(r)
+    if r and r.uri then open_uri(r.uri) end
+  end)
+end
+
+function M.diary_prev()
+  exec('nuwiki.diary.prev', uri_args(), function(r)
+    if r and r.uri then open_uri(r.uri) end
+  end)
+end
+
+function M.diary_generate_index()
+  -- Returns a WorkspaceEdit; the server's executeCommand handler will
+  -- have already applied it via applyEdit, so there's nothing to do here.
+  exec('nuwiki.diary.generateIndex', uri_args())
+end
+
+-- ===== List + heading editing =====
+
+local function _exec_pos(cmd_name)
+  return function() exec(cmd_name, pos_args()) end
+end
+
+M.toggle_list_item = _exec_pos('nuwiki.list.toggleCheckbox')
+M.cycle_list_item = _exec_pos('nuwiki.list.cycleCheckbox')
+M.reject_list_item = _exec_pos('nuwiki.list.rejectCheckbox')
+M.heading_add_level = _exec_pos('nuwiki.heading.addLevel')
+M.heading_remove_level = _exec_pos('nuwiki.heading.removeLevel')
+
+function M.next_task()
+  exec('nuwiki.list.nextTask', pos_args(), function(loc)
+    if loc and loc.range and loc.range.start then
+      vim.api.nvim_win_set_cursor(0, {
+        loc.range.start.line + 1,
+        loc.range.start.character,
+      })
+    end
+  end)
+end
+
+-- ===== Generation + workspace =====
+
+M.toc_generate = function() exec('nuwiki.toc.generate', uri_args()) end
+M.links_generate = function() exec('nuwiki.links.generate', uri_args()) end
+
+function M.check_links()
+  exec('nuwiki.workspace.checkLinks', uri_args(), function(r)
+    if type(r) ~= 'table' or #r == 0 then
+      vim.notify('nuwiki: no broken links')
+      return
+    end
+    local items = {}
+    for _, b in ipairs(r) do
+      table.insert(items, {
+        filename = vim.uri_to_fname(b.uri),
+        lnum = (b.range and b.range.start and b.range.start.line or 0) + 1,
+        col = (b.range and b.range.start and b.range.start.character or 0) + 1,
+        text = (b.kind or '?') .. ': ' .. (b.message or ''),
+      })
+    end
+    vim.fn.setqflist({}, ' ', { title = 'nuwiki broken links', items = items })
+    vim.cmd('copen')
+  end)
+end
+
+function M.find_orphans()
+  exec('nuwiki.workspace.findOrphans', uri_args(), function(r)
+    if type(r) ~= 'table' or #r == 0 then
+      vim.notify('nuwiki: no orphan pages')
+      return
+    end
+    local items = {}
+    for _, o in ipairs(r) do
+      table.insert(items, {
+        filename = vim.uri_to_fname(o.uri),
+        text = o.name or '?',
+      })
+    end
+    vim.fn.setqflist({}, ' ', { title = 'nuwiki orphans', items = items })
+    vim.cmd('copen')
+  end)
+end
+
+-- ===== Tags =====
+
+function M.tags_search(query)
+  if not query or query == '' then
+    query = vim.fn.input('Search tags: ')
+  end
+  exec('nuwiki.tags.search', { { uri = buf_uri(), query = query } }, function(r)
+    if type(r) ~= 'table' or #r == 0 then
+      vim.notify('nuwiki: no tag matches')
+      return
+    end
+    local items = {}
+    for _, h in ipairs(r) do
+      table.insert(items, {
+        filename = vim.uri_to_fname(h.uri),
+        lnum = (h.range and h.range.start and h.range.start.line or 0) + 1,
+        col = (h.range and h.range.start and h.range.start.character or 0) + 1,
+        text = ':' .. h.name .. ': in ' .. (h.page or '?'),
+      })
+    end
+    vim.fn.setqflist({}, ' ', { title = 'nuwiki tag search', items = items })
+    vim.cmd('copen')
+  end)
+end
+
+function M.tags_generate_links(tag)
+  local args = { uri = buf_uri() }
+  if tag and tag ~= '' then
+    args.tag = tag
+  end
+  exec('nuwiki.tags.generateLinks', { args })
+end
+
+function M.tags_rebuild()
+  exec('nuwiki.tags.rebuild', uri_args(), function(r)
+    if r and r.pages then
+      vim.notify(string.format('nuwiki: re-indexed %d page(s)', r.pages))
+    end
+  end)
+end
+
+-- ===== Export =====
+
+M.export_current = function() exec('nuwiki.export.currentToHtml', uri_args()) end
+M.export_all = function() exec('nuwiki.export.allToHtml', uri_args()) end
+M.export_all_force = function() exec('nuwiki.export.allToHtmlForce', uri_args()) end
+M.export_rss = function() exec('nuwiki.export.rss', uri_args()) end
+
+function M.export_browse()
+  exec('nuwiki.export.browse', uri_args(), function(r)
+    local url = r and r.browse
+    if not url then return end
+    -- Best-effort browser open. Falls back to a notification.
+    local opener
+    if vim.fn.has('mac') == 1 then
+      opener = 'open'
+    elseif vim.fn.has('unix') == 1 then
+      opener = 'xdg-open'
+    elseif vim.fn.has('win32') == 1 then
+      opener = 'start'
+    end
+    if opener then
+      vim.fn.jobstart({ opener, url }, { detach = true })
+    else
+      vim.notify('nuwiki: exported → ' .. url)
+    end
+  end)
+end
+
+-- ===== File ops =====
+
+function M.delete_file()
+  local ans = vim.fn.input('Delete current page? [y/N] ')
+  if ans:lower() ~= 'y' then return end
+  exec('nuwiki.file.delete', { { uri = buf_uri() } })
+end
+
+function M.rename_file()
+  vim.lsp.buf.rename()
+end
+
+-- ===== Deferred placeholders (§13.1) =====
+--
+-- These commands aren't implemented on the server yet. Stub them so the
+-- `:Vimwiki*` compat surface exists and users get a clear message
+-- instead of "unknown command".
+
+local function _not_yet(name)
+  return function()
+    vim.notify(
+      'nuwiki: ' .. name .. ' is not yet implemented — see SPEC §13.1',
+      vim.log.levels.WARN
+    )
+  end
+end
+
+M.list_change_lvl = _not_yet(':VimwikiListChangeLvl')
+M.list_renumber = _not_yet(':VimwikiRenumber')
+M.list_remove_done = _not_yet(':VimwikiRemoveDone')
+M.table_insert = _not_yet(':VimwikiTable')
+M.table_move_column_left = _not_yet(':VimwikiTableMoveColumnLeft')
+M.table_move_column_right = _not_yet(':VimwikiTableMoveColumnRight')
+M.colorize = _not_yet(':VimwikiColorize')
+M.paste_link = _not_yet(':VimwikiPasteLink')
+M.paste_url = _not_yet(':VimwikiPasteUrl')
+
+return M

lua/nuwiki/config.lua

@@ -1,6 +1,7 @@
 -- lua/nuwiki/config.lua — defaults and user-config merge.
 --
--- Schema mirrors SPEC §7.5. Keep this aligned with `doc/nuwiki.txt`.
+-- Schema mirrors SPEC §7.5 + §12.11. Keep this aligned with
+-- `doc/nuwiki.txt`.
 
 local M = {}
 
@@ -9,6 +10,22 @@ M.defaults = {
   file_extension = '.wiki',
   syntax         = 'vimwiki',
   log_level      = 'warn',
+
+  -- Phase 19: per-buffer glue. Each subgroup can be flipped off
+  -- independently to suppress the corresponding keymaps.
+  mappings = {
+    enabled       = true,
+    list_editing  = true,
+    header_nav    = true,
+    diary         = true,
+    html_export   = true,
+    text_objects  = true,
+  },
+
+  -- Phase 19: folding. `'lsp'` uses the server's `foldingRange`
+  -- provider (Neovim 0.11+ wires it automatically). `'expr'` falls
+  -- back to a regex-based `foldexpr`. `'off'` skips folding setup.
+  folding = 'lsp',
 }
 
 M.options = vim.deepcopy(M.defaults)

lua/nuwiki/folding.lua

@@ -0,0 +1,42 @@
+-- lua/nuwiki/folding.lua — `foldexpr` fallback when the LSP isn't
+-- attached. Same heading-block model as the server-side `foldingRange`
+-- provider in `crates/nuwiki-lsp/src/folding.rs`, but driven from a
+-- pure regex over `getline()` so it works without a running server.
+--
+-- Activated by `setlocal foldmethod=expr foldexpr=v:lua.require'nuwiki.folding'.expr()`
+-- in `ftplugin/nuwiki.vim` when `folding` is enabled in the user config.
+
+local M = {}
+
+--- Heading level from one line of source. Returns 0 for non-headings.
+local function heading_level(line)
+  local lead = line:match('^%s*(=+)%s')
+  if not lead then return 0 end
+  local lvl = #lead
+  if lvl > 6 then return 0 end
+  -- Require a matching trailing run of `=`s.
+  local trail = line:match('%s(=+)%s*$')
+  if not trail or #trail ~= lvl then return 0 end
+  return lvl
+end
+
+--- `foldexpr` body. Returns a fold-marker string per `:help fold-expr`.
+function M.expr()
+  local lnum = vim.v.lnum
+  local line = vim.fn.getline(lnum)
+  local lvl = heading_level(line)
+  if lvl > 0 then
+    return '>' .. lvl
+  end
+  return '='
+end
+
+--- Build a heading-only `foldtext` showing the heading title trimmed.
+function M.foldtext()
+  local fs = vim.v.foldstart
+  local line = vim.fn.getline(fs):gsub('=', ''):gsub('^%s+', ''):gsub('%s+$', '')
+  local count = vim.v.foldend - vim.v.foldstart + 1
+  return string.format('▸ %s … (%d lines)', line, count)
+end
+
+return M

lua/nuwiki/ftplugin.lua

@@ -0,0 +1,57 @@
+-- lua/nuwiki/ftplugin.lua — per-buffer hookup invoked by
+-- `ftplugin/nuwiki.vim`. Centralises the Lua side of Phase 19 so the
+-- VimL ftplugin stays a one-liner regardless of which subgroups are
+-- enabled.
+
+local M = {}
+
+local function setup_folding(bufnr, folding_mode)
+  if folding_mode == 'off' then
+    return
+  end
+  if folding_mode == 'expr' then
+    vim.api.nvim_set_option_value('foldmethod', 'expr', { buf = bufnr })
+    vim.api.nvim_set_option_value(
+      'foldexpr',
+      'v:lua.require("nuwiki.folding").expr()',
+      { buf = bufnr }
+    )
+    vim.api.nvim_set_option_value(
+      'foldtext',
+      'v:lua.require("nuwiki.folding").foldtext()',
+      { buf = bufnr }
+    )
+    return
+  end
+  -- folding_mode == 'lsp' (default): rely on the server's
+  -- `foldingRange` capability. Neovim 0.11+ enables it automatically
+  -- via `vim.lsp.foldexpr`. Older versions get the regex fallback.
+  if vim.fn.has('nvim-0.11') == 1 and vim.lsp.foldexpr then
+    vim.api.nvim_set_option_value('foldmethod', 'expr', { buf = bufnr })
+    vim.api.nvim_set_option_value(
+      'foldexpr',
+      'v:lua.vim.lsp.foldexpr()',
+      { buf = bufnr }
+    )
+  else
+    -- Pre-0.11 — degrade to the regex fallback so users still get folds.
+    setup_folding(bufnr, 'expr')
+  end
+end
+
+function M.attach(bufnr)
+  bufnr = bufnr or 0
+  local config = require('nuwiki.config')
+  local opts = config.options or config.defaults
+
+  if opts.mappings and opts.mappings.enabled ~= false then
+    require('nuwiki.keymaps').attach(bufnr, opts.mappings)
+    if opts.mappings.text_objects ~= false then
+      require('nuwiki.textobjects').attach(bufnr)
+    end
+  end
+
+  setup_folding(bufnr, opts.folding or 'lsp')
+end
+
+return M

lua/nuwiki/health.lua

@@ -1,20 +1,16 @@
 -- lua/nuwiki/health.lua — `:checkhealth nuwiki` target.
 --
--- Checks per SPEC §7.6: binary exists, is executable, LSP client running,
--- filetype detection works for `.wiki`.
+-- v1.0 checks per SPEC §7.6 (binary, version, filetype, LSP attach).
+-- v1.1 §12.10 additions: registered LSP commands, indexed wikis, HTML
+-- output path writability, default keymaps installed.
 
 local M = {}
 
-function M.check()
+local function bin_section()
   local install = require('nuwiki.install')
-  local config = require('nuwiki.config')
-
-  vim.health.start('nuwiki')
-
   local bin = install.expected_path()
   if install.is_installed() then
     vim.health.ok('binary present at ' .. bin)
-
     local out = vim.fn.system({ bin, '--version' })
     if vim.v.shell_error == 0 then
       vim.health.ok('binary --version: ' .. (out:gsub('\n', ' ')):gsub('^%s+', ''))
@@ -30,8 +26,10 @@ function M.check()
       { 'Run :lua require("nuwiki").install() to install' }
     )
   end
+end
 
-  local root = vim.fn.expand(config.options.wiki_root or '')
+local function wiki_root_section(opts)
+  local root = vim.fn.expand(opts.wiki_root or '')
   if root ~= '' then
     if vim.fn.isdirectory(root) == 1 then
       vim.health.ok('wiki_root exists: ' .. root)
@@ -39,21 +37,88 @@ function M.check()
       vim.health.warn('wiki_root does not exist: ' .. root)
     end
   end
+end
 
+local function filetype_section()
   if vim.fn.exists('#filetypedetect#BufRead#*.wiki') ~= 0
      or vim.filetype.match({ filename = 'test.wiki' }) == 'vimwiki' then
     vim.health.ok('filetype detection for *.wiki is wired up')
   else
     vim.health.warn('filetype detection for *.wiki not active')
   end
+end
 
-  local clients = vim.lsp.get_clients and vim.lsp.get_clients({ name = 'nuwiki' })
-    or vim.lsp.get_active_clients({ name = 'nuwiki' })
-  if clients and #clients > 0 then
-    vim.health.ok('LSP client attached (' .. #clients .. ' instance(s))')
+local function clients()
+  return (vim.lsp.get_clients or vim.lsp.get_active_clients)({ name = 'nuwiki' })
+end
+
+local function lsp_section()
+  local cs = clients()
+  if cs and #cs > 0 then
+    vim.health.ok('LSP client attached (' .. #cs .. ' instance(s))')
+    local cl = cs[1]
+    local cmds = vim.tbl_get(
+      cl,
+      'server_capabilities',
+      'executeCommandProvider',
+      'commands'
+    ) or {}
+    if #cmds > 0 then
+      vim.health.ok('server advertises ' .. #cmds .. ' executeCommand entries')
+    else
+      vim.health.info('server has not yet reported executeCommand entries')
+    end
+    local folding = vim.tbl_get(cl, 'server_capabilities', 'foldingRangeProvider')
+    if folding then
+      vim.health.ok('server supports textDocument/foldingRange')
+    else
+      vim.health.info('server has not advertised foldingRange capability')
+    end
   else
     vim.health.info('LSP client not yet attached — open a .wiki buffer')
   end
 end
 
+local function html_section(opts)
+  local html_path = (opts.wikis and opts.wikis[1] and opts.wikis[1].html_path)
+    or (opts.wiki_root and (vim.fn.expand(opts.wiki_root) .. '/_html'))
+  if not html_path or html_path == '' then
+    return
+  end
+  if vim.fn.isdirectory(html_path) == 1 then
+    -- Probe writability with `filewritable` on the directory.
+    if vim.fn.filewritable(html_path) == 2 then
+      vim.health.ok('html output dir writable: ' .. html_path)
+    else
+      vim.health.warn('html output dir exists but not writable: ' .. html_path)
+    end
+  else
+    vim.health.info(
+      'html output dir does not exist yet (created on first export): ' .. html_path
+    )
+  end
+end
+
+local function mappings_section(opts)
+  if opts.mappings and opts.mappings.enabled == false then
+    vim.health.info('default keymaps disabled by user config')
+    return
+  end
+  vim.health.ok('default keymaps enabled (subgroups: '
+    .. table.concat(vim.tbl_keys(opts.mappings or {}), ',') .. ')')
+end
+
+function M.check()
+  local config = require('nuwiki.config')
+  local opts = config.options or config.defaults
+
+  vim.health.start('nuwiki')
+  bin_section()
+  wiki_root_section(opts)
+  filetype_section()
+  lsp_section()
+  html_section(opts)
+  mappings_section(opts)
+end
+
 return M

lua/nuwiki/keymaps.lua

@@ -0,0 +1,73 @@
+-- lua/nuwiki/keymaps.lua — buffer-local key bindings for `.wiki` buffers.
+--
+-- Opt-in via `mappings.enabled = true` (default). Subgroups can be
+-- disabled independently — see `defaults.lua` for the schema.
+--
+-- Mappings here cover the subset of vimwiki's defaults whose server-side
+-- commands are implemented. Anything pointing at a SPEC §13.1 deferred
+-- command is intentionally omitted to avoid surprising no-ops.
+
+local M = {}
+
+local function map(mode, lhs, rhs, opts, bufnr)
+  opts = vim.tbl_extend('force', { buffer = bufnr or 0, silent = true }, opts or {})
+  vim.keymap.set(mode, lhs, rhs, opts)
+end
+
+--- Register all keymaps for the given buffer. Caller passes the
+--- effective `mappings` config (already merged with defaults).
+function M.attach(bufnr, mappings)
+  local cmd = require('nuwiki.commands')
+
+  if not mappings or mappings.enabled == false then
+    return
+  end
+
+  -- ===== Wiki navigation =====
+  map('n', '<Leader>ww', cmd.diary_today, { desc = 'nuwiki: open today\'s diary' }, bufnr)
+  map('n', '<Leader>wt', cmd.diary_today, { desc = 'nuwiki: open today\'s diary' }, bufnr)
+  map('n', '<Leader>ws', cmd.wiki_ui_select, { desc = 'nuwiki: pick wiki' }, bufnr)
+  map('n', '<Leader>wi', cmd.diary_index, { desc = 'nuwiki: open diary index' }, bufnr)
+  map('n', '<Leader>w<Leader>w', cmd.diary_today, { desc = 'nuwiki: today' }, bufnr)
+  map('n', '<Leader>w<Leader>y', cmd.diary_yesterday, { desc = 'nuwiki: yesterday' }, bufnr)
+  map('n', '<Leader>w<Leader>t', cmd.diary_tomorrow, { desc = 'nuwiki: tomorrow' }, bufnr)
+  map('n', '<Leader>wd', cmd.delete_file, { desc = 'nuwiki: delete page' }, bufnr)
+  map('n', '<Leader>wr', cmd.rename_file, { desc = 'nuwiki: rename page' }, bufnr)
+  map('n', '<Leader>wn', cmd.wiki_goto_page, { desc = 'nuwiki: goto page' }, bufnr)
+
+  -- Link follow / nav
+  map('n', '<CR>', vim.lsp.buf.definition, { desc = 'nuwiki: follow link' }, bufnr)
+  map('n', '<Backspace>', '<C-o>', { desc = 'nuwiki: go back', remap = true }, bufnr)
+
+  -- ===== Diary nav =====
+  if mappings.diary ~= false then
+    map('n', '<C-Down>', cmd.diary_next, { desc = 'nuwiki: next diary entry' }, bufnr)
+    map('n', '<C-Up>', cmd.diary_prev, { desc = 'nuwiki: previous diary entry' }, bufnr)
+  end
+
+  -- ===== List editing =====
+  if mappings.list_editing ~= false then
+    map('n', '<C-Space>', cmd.toggle_list_item, { desc = 'nuwiki: toggle checkbox' }, bufnr)
+    map('n', 'gnt', cmd.next_task, { desc = 'nuwiki: next unfinished task' }, bufnr)
+    map('n', 'gln', cmd.cycle_list_item, { desc = 'nuwiki: cycle checkbox' }, bufnr)
+    map('n', 'glp', cmd.cycle_list_item, { desc = 'nuwiki: cycle checkbox' }, bufnr)
+    map('n', 'glx', cmd.reject_list_item, { desc = 'nuwiki: reject checkbox' }, bufnr)
+  end
+
+  -- ===== Header level =====
+  if mappings.header_nav ~= false then
+    -- `=`/`-` is the vimwiki default but collides with Vim's built-in
+    -- reformat operator. Use `g=` / `g-` instead to stay out of the way.
+    map('n', 'g=', cmd.heading_add_level, { desc = 'nuwiki: heading deeper' }, bufnr)
+    map('n', 'g-', cmd.heading_remove_level, { desc = 'nuwiki: heading shallower' }, bufnr)
+  end
+
+  -- ===== HTML export =====
+  if mappings.html_export ~= false then
+    map('n', '<Leader>wh', cmd.export_current, { desc = 'nuwiki: export to HTML' }, bufnr)
+    map('n', '<Leader>whh', cmd.export_browse, { desc = 'nuwiki: export + browse' }, bufnr)
+    map('n', '<Leader>wha', cmd.export_all, { desc = 'nuwiki: export all' }, bufnr)
+  end
+end
+
+return M

lua/nuwiki/textobjects.lua

@@ -0,0 +1,64 @@
+-- lua/nuwiki/textobjects.lua — text objects (Phase 19).
+--
+-- Currently ships `ah` / `ih` (around / inside heading). The remaining
+-- four objects from SPEC §12.10 (`aH`/`iH`, `a\`/`i\`, `ac`/`ic`,
+-- `al`/`il`) need the table/list rewriters from §13.1 to be fully
+-- useful — they ship together with those commands in a follow-up.
+
+local M = {}
+
+local function heading_level(line)
+  local lead = line and line:match('^%s*(=+)%s')
+  if not lead then return 0 end
+  local trail = line:match('%s(=+)%s*$')
+  if not trail or #trail ~= #lead then return 0 end
+  return #lead
+end
+
+--- Find the start and end line of the heading block containing `lnum`.
+--- A heading block runs from the heading line to the line before the
+--- next heading of same-or-higher level (or end-of-buffer).
+local function heading_block(lnum)
+  local total = vim.api.nvim_buf_line_count(0)
+  -- Walk back to the nearest heading line.
+  local start
+  for i = lnum, 1, -1 do
+    local lvl = heading_level(vim.fn.getline(i))
+    if lvl > 0 then
+      start = i
+      break
+    end
+  end
+  if not start then return nil end
+  local level = heading_level(vim.fn.getline(start))
+  -- Walk forward for the next heading of same-or-higher level.
+  local stop = total
+  for i = start + 1, total do
+    local lvl = heading_level(vim.fn.getline(i))
+    if lvl > 0 and lvl <= level then
+      stop = i - 1
+      break
+    end
+  end
+  return start, stop
+end
+
+--- Operator-pending entry point. `inner` strips the heading line itself.
+function M.select(inner)
+  local lnum = vim.fn.line('.')
+  local s, e = heading_block(lnum)
+  if not s then return end
+  if inner then
+    s = s + 1
+  end
+  if e < s then return end
+  vim.cmd(string.format('normal! %dG0V%dG$', s, e))
+end
+
+function M.attach(bufnr)
+  local opts = { buffer = bufnr or 0, silent = true }
+  vim.keymap.set({ 'o', 'x' }, 'ah', function() M.select(false) end, opts)
+  vim.keymap.set({ 'o', 'x' }, 'ih', function() M.select(true) end, opts)
+end
+
+return M