diff --git a/.copier-answers.yaml b/.copier-answers.yaml
index 44d66b16..6a909f2e 100644
--- a/.copier-answers.yaml
+++ b/.copier-answers.yaml
@@ -1,5 +1,5 @@
 # Changes here will be overwritten by Copier
-_commit: ebb6e1c
+_commit: '4372075'
 _src_path: https://github.com/python-project-templates/base.git
 add_docs: false
 add_extension: python
diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index f92bd2bd..b6e816d5 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -15,7 +15,7 @@ on:
   workflow_dispatch:
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
 permissions:
diff --git a/Makefile b/Makefile
index ac6be824..05e115eb 100644
--- a/Makefile
+++ b/Makefile
@@ -25,16 +25,16 @@ lint-py:  ## lint python with ruff
 	python -m ruff format --check yardang
 
 lint-docs:  ## lint docs with mdformat and codespell
-	python -m mdformat --check README.md 
-	python -m codespell_lib README.md 
+	python -m mdformat --check README.md $(wildcard docs/src)
+	python -m codespell_lib README.md $(wildcard docs/src)
 
 fix-py:  ## autoformat python code with ruff
 	python -m ruff check --fix yardang
 	python -m ruff format yardang
 
 fix-docs:  ## autoformat docs with mdformat and codespell
-	python -m mdformat README.md 
-	python -m codespell_lib --write README.md 
+	python -m mdformat README.md $(wildcard docs/src)
+	python -m codespell_lib --write README.md $(wildcard docs/src)
 
 lint: lint-py lint-docs  ## run all linters
 lints: lint
@@ -52,7 +52,7 @@ check-dist:  ## check python sdist and wheel with check-dist
 check-types:  ## check python types with ty
 	ty check --python $$(which python)
 
-checks: check-dist
+checks: check-dist check-types
 
 # Alias
 check: checks
diff --git a/docs/src/api.md b/docs/src/api.md
index f21f8337..5a268f23 100644
--- a/docs/src/api.md
+++ b/docs/src/api.md
@@ -118,4 +118,3 @@ Use `js:autoclass` to document classes:
    :members:
 
 ```
-
diff --git a/docs/src/configuration.md b/docs/src/configuration.md
index d1b1ed3b..5ccf666f 100644
--- a/docs/src/configuration.md
+++ b/docs/src/configuration.md
@@ -16,6 +16,7 @@ pages = [
 ]
 use-autoapi = true
 ```
+
 ## [`name`](https://www.sphinx-doc.org/en/master/usage/configuration.html#confval-project)
 
 The project name is taken from the standard section, or from the `cwd`.
@@ -101,22 +102,22 @@ theme = "fuma"
 html_theme_options = { github_url = "https://github.com/you/project", toc_style = "clerk" }
 ```
 
-| Option | Default | Description |
-| --- | --- | --- |
-| `layout` | `docs` | `docs` puts the header beside the sidebar; `notebook` spans it across the top. |
-| `toc_style` | `normal` | `clerk` dims headings away from the current one. |
-| `color_preset` | `neutral` | Accent colour: `neutral`, `amber`, `blue`, `emerald`, `purple`, `rose`. |
-| `fonts` | `bundled` | `system` skips the bundled webfonts and uses the system stack. |
-| `search` | `true` | Enables the search dialog and its index. |
-| `sidebar_hide_name` | `false` | Hides the project name next to the logo. |
-| `default_open_level` | `1` | Sidebar folder depth expanded by default. |
-| `github_url` | — | Adds a GitHub link, and an "Edit this page" link. |
-| `edit_page_url_template` | — | Overrides the edit link, e.g. `https://host/edit/main/{filename}`. |
-| `nav_links` | — | Header links, as `[{title, url}]` or `"Title\|url, Title\|url"`. |
-| `sidebar_tabs` | — | Navigator entries under the search box, as `[{title, url, description, icon, match}]`. |
-| `announcement` | — | Banner text shown above the header. |
-| `footer_text` | — | Extra line in the footer. |
-| `light_css_variables` / `dark_css_variables` | — | CSS custom property overrides, e.g. `{ "color-fd-primary" = "#e11d48" }`. |
+| Option                                       | Default   | Description                                                                            |
+| -------------------------------------------- | --------- | -------------------------------------------------------------------------------------- |
+| `layout`                                     | `docs`    | `docs` puts the header beside the sidebar; `notebook` spans it across the top.         |
+| `toc_style`                                  | `normal`  | `clerk` dims headings away from the current one.                                       |
+| `color_preset`                               | `neutral` | Accent colour: `neutral`, `amber`, `blue`, `emerald`, `purple`, `rose`.                |
+| `fonts`                                      | `bundled` | `system` skips the bundled webfonts and uses the system stack.                         |
+| `search`                                     | `true`    | Enables the search dialog and its index.                                               |
+| `sidebar_hide_name`                          | `false`   | Hides the project name next to the logo.                                               |
+| `default_open_level`                         | `1`       | Sidebar folder depth expanded by default.                                              |
+| `github_url`                                 | —         | Adds a GitHub link, and an "Edit this page" link.                                      |
+| `edit_page_url_template`                     | —         | Overrides the edit link, e.g. `https://host/edit/main/{filename}`.                     |
+| `nav_links`                                  | —         | Header links, as `[{title, url}]` or `"Title\|url, Title\|url"`.                       |
+| `sidebar_tabs`                               | —         | Navigator entries under the search box, as `[{title, url, description, icon, match}]`. |
+| `announcement`                               | —         | Banner text shown above the header.                                                    |
+| `footer_text`                                | —         | Extra line in the footer.                                                              |
+| `light_css_variables` / `dark_css_variables` | —         | CSS custom property overrides, e.g. `{ "color-fd-primary" = "#e11d48" }`.              |
 
 #### Content components
 
@@ -400,7 +401,6 @@ language = "en"
 pygments_style = "sphinx"
 ```
 
-
 ## [Myst](https://myst-parser.readthedocs.io/en/latest/#)
 
 ```toml
@@ -531,7 +531,6 @@ mindmap
       Mermaid
 ```
 
-
 ## GitHub Admonitions
 
 GitHub admonitions are automatically translated to sphinx.
@@ -835,7 +834,7 @@ rustdoc-fmt = { mylib-utils = "rst" }
 
 The pages are generated for you, so your documentation files only need a toctree entry pointing at them:
 
-````markdown
+```markdown
 # API Reference
 
 \`\`\`{toctree}
@@ -844,7 +843,7 @@ The pages are generated for you, so your documentation files only need a toctree
 /api/mylib/lib
 /api/mylib-utils/lib
 \`\`\`
-````
+```
 
 ## Sphinx-JS Integration
 
@@ -941,7 +940,7 @@ ts-type-bold = true
 
 Then in your documentation files, you can use sphinx-js directives:
 
-````markdown
+```markdown
 # API Reference
 
 ## Functions
@@ -959,7 +958,7 @@ Then in your documentation files, you can use sphinx-js directives:
 
 \`\`\`{js:automodule} myModule
 \`\`\`
-````
+```
 
 ## GitHub Wiki Integration
 
@@ -1123,6 +1122,7 @@ git push
 ```
 
 The generated wiki includes:
+
 - `Home.md` - The main landing page (converted from index.md)
 - `_Sidebar.md` - Navigation sidebar with links to all pages
 - `_Footer.md` - Footer with links to documentation and repository
diff --git a/docs/src/home.md b/docs/src/home.md
index 6c1a8293..84db071e 100644
--- a/docs/src/home.md
+++ b/docs/src/home.md
@@ -1,5 +1,3 @@
-
-
 <div style="display: flex; flex-direction: row; margin-top:50px;">
   <a href="https://github.com/python-project-templates/yardang"><img src="https://github.com/python-project-templates/yardang/blob/main/docs/logo.png?raw=true" alt="yardang" width="120"></a>
   <h1 style="margin-left: 20px;">yardang</h1>
@@ -15,7 +13,6 @@
 
 [`yardang`](https://www.britannica.com/science/yardang) makes building [Sphinx](https://www.sphinx-doc.org/en/master/) easy.
 
-
 ::::{grid} 1 2 2 2
 :margin: 4 4 0 0
 :gutter: 1
@@ -49,6 +46,6 @@ Star, Fork, or contribute on GitHub.
 :::
 ::::
 
--------------
+______________________________________________________________________
 
 *This library was generated using [copier](https://copier.readthedocs.io/en/stable/) from the [Base Python Project Template repository](https://github.com/python-project-templates/base).*
diff --git a/pyproject.toml b/pyproject.toml
index 23027440..05a9737a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -73,6 +73,7 @@ develop = [
     "codespell",
     "hatchling",
     "mdformat",
+    "mdformat-frontmatter",
     "mdformat-tables>=1",
     "pytest",
     "pytest-cov",
@@ -117,7 +118,7 @@ replace = 'version = "{new_version}"'
 [tool.coverage.run]
 branch = true
 omit = [
-    "yardang/tests/integration/",
+    "yardang/tests/integration/*",
 ]
 
 [tool.coverage.report]
diff --git a/yardang/build.py b/yardang/build.py
index 49e2ec14..43f348f6 100644
--- a/yardang/build.py
+++ b/yardang/build.py
@@ -298,8 +298,8 @@ def customize(args):
         custom_css = custom_css if custom_css is not None else get_config_flex(section="custom-css", base=config_base)
         custom_js = custom_js if custom_js is not None else get_config_flex(section="custom-js", base=config_base)
         assets_dir = Path(__file__).parent
-        custom_css = _resolve_custom_asset(custom_css, theme, "css", assets_dir=assets_dir)
-        custom_js = _resolve_custom_asset(custom_js, theme, "js", assets_dir=assets_dir)
+        custom_css_content = _resolve_custom_asset(custom_css, theme, "css", assets_dir=assets_dir)
+        custom_js_content = _resolve_custom_asset(custom_js, theme, "js", assets_dir=assets_dir)
 
         source_dir = source_dir or get_config_flex(section="source-dir", base=config_base)
         existing_source = source_dir is not None
@@ -635,10 +635,10 @@ def customize(args):
             html_output = Path(html_output_dir) if html_output_dir is not None else Path("docs/html")
             styles_dir = html_output / "_static" / "styles"
             styles_dir.mkdir(parents=True, exist_ok=True)
-            (styles_dir / "custom.css").write_text(custom_css or "")
+            (styles_dir / "custom.css").write_text(custom_css_content or "")
             js_dir = html_output / "_static" / "js"
             js_dir.mkdir(parents=True, exist_ok=True)
-            (js_dir / "custom.js").write_text(custom_js or "")
+            (js_dir / "custom.js").write_text(custom_js_content or "")
 
             # append docs-specific ignores to gitignore
             if not existing_source and Path(".gitignore").exists():
@@ -665,23 +665,23 @@ def customize(args):
 @contextmanager
 def generate_wiki_configuration(
     *,
-    project: str = "",
-    title: str = "",
-    module: str = "",
-    description: str = "",
-    author: str = "",
-    copyright: str = "",
-    version: str = "",
-    theme: str = "furo",
-    docs_root: str = "",
-    root: str = "",
-    cname: str = "",
+    project: str | None = "",
+    title: str | None = "",
+    module: str | None = "",
+    description: str | None = "",
+    author: str | None = "",
+    copyright: str | None = "",
+    version: str | None = "",
+    theme: str | None = "furo",
+    docs_root: str | None = "",
+    root: str | None = "",
+    cname: str | None = "",
     pages: list | None = None,
     use_autoapi: bool | None = None,
     autoapi_ignore: list | None = None,
     custom_css: Path | None = None,
     custom_js: Path | None = None,
-    config_base: str = "tool.yardang",
+    config_base: str | None = "tool.yardang",
     previous_versions: bool | None = False,
     adjust_arguments: Callable | None = None,
     adjust_template: Callable | None = None,
diff --git a/yardang/cli.py b/yardang/cli.py
index 15157c4f..494fdd42 100644
--- a/yardang/cli.py
+++ b/yardang/cli.py
@@ -72,9 +72,9 @@ def build(
             sleep(0.1)
         if process.returncode != 0:
             if pdb:
-                import pdb  # noqa: T100
+                import pdb as debugger  # noqa: T100
 
-                pdb.set_trace()  # noqa: T100
+                debugger.set_trace()  # noqa: T100
             raise Exit(process.returncode)
 
 
@@ -170,9 +170,9 @@ def wiki(
             sleep(0.1)
         if process.returncode != 0:
             if pdb:
-                import pdb  # noqa: T100
+                import pdb as debugger  # noqa: T100
 
-                pdb.set_trace()  # noqa: T100
+                debugger.set_trace()  # noqa: T100
             raise Exit(process.returncode)
 
         # Post-process for GitHub Wiki compatibility
diff --git a/yardang/sphinx/llms.py b/yardang/sphinx/llms.py
index dfd9fd28..c770f759 100644
--- a/yardang/sphinx/llms.py
+++ b/yardang/sphinx/llms.py
@@ -1,8 +1,10 @@
 from pathlib import Path
+from typing import cast
 from urllib.parse import urlsplit, urlunsplit
 
 from docutils import nodes
 from sphinx.application import Sphinx
+from sphinx.builders import Builder
 from sphinx_markdown_builder.builder import MarkdownBuilder
 from sphinx_markdown_builder.translator import MarkdownTranslator
 
@@ -42,7 +44,7 @@ def __init__(self, app: Sphinx):
         self.current_doc_name = ""
 
     def create_translator(self, *args):
-        return self.app.registry.create_translator(self, *args)
+        return self.app.registry.create_translator(cast(Builder, self), *args)
 
     @staticmethod
     def get_target_uri(docname: str, typ: str | None = None) -> str:
diff --git a/yardang/tests/test_all.py b/yardang/tests/test_all.py
index b4921632..a1f4b52a 100644
--- a/yardang/tests/test_all.py
+++ b/yardang/tests/test_all.py
@@ -5,7 +5,7 @@
 from typer import Exit
 
 from yardang.build import generate_docs_configuration
-from yardang.cli import build, debug
+from yardang.cli import build, debug, wiki
 from yardang.utils import get_config_flex
 
 
@@ -19,7 +19,8 @@ def test_cli():
     debug()
 
 
-def test_cli_pdb_on_failure(monkeypatch):
+@pytest.mark.parametrize("command", [build, wiki])
+def test_cli_pdb_on_failure(monkeypatch, command):
     class FailedProcess:
         returncode = 1
 
@@ -32,7 +33,7 @@ def poll():
     monkeypatch.setattr("pdb.set_trace", lambda: traced.append(True))
 
     with pytest.raises(Exit):
-        build(pdb=True)
+        command(pdb=True)
 
     assert traced == [True]
 
diff --git a/yardang/tests/test_llms.py b/yardang/tests/test_llms.py
index 90cc0ced..4f422f0e 100644
--- a/yardang/tests/test_llms.py
+++ b/yardang/tests/test_llms.py
@@ -136,13 +136,14 @@ def test_full_build_can_be_disabled(tmp_path, monkeypatch):
     assert "llms-full.txt" not in (output / "llms.txt").read_text()
 
 
-def test_explicit_builder_copies_downloads(tmp_path, monkeypatch):
+@pytest.mark.parametrize("builder", ["html", "yardang-llms"])
+def test_llms_builders_copy_downloads(tmp_path, monkeypatch, builder):
     _write_project(tmp_path)
     monkeypatch.chdir(tmp_path)
     output = tmp_path / "llms"
 
     with generate_docs_configuration() as conf_dir:
-        result = build_main(["-q", "-b", "yardang-llms", "-c", str(conf_dir), ".", str(output)])
+        result = build_main(["-q", "-b", builder, "-c", str(conf_dir), ".", str(output)])
 
     assert result == 0
     download = re.search(r"\]\(([^)]*_downloads/[^)]+)\)", (output / "index.html.md").read_text())
diff --git a/yardang/tests/test_sphinx.py b/yardang/tests/test_sphinx.py
index d1c19fc2..ea6e7fd6 100644
--- a/yardang/tests/test_sphinx.py
+++ b/yardang/tests/test_sphinx.py
@@ -32,6 +32,8 @@ def test_github_admonition_preserves_quoted_blank_lines(tmp_path, monkeypatch):
 
     with generate_docs_configuration() as conf_dir:
         spec = importlib.util.spec_from_file_location("yardang_test_conf", Path(conf_dir) / "conf.py")
+        assert spec is not None
+        assert spec.loader is not None
         conf = importlib.util.module_from_spec(spec)
         spec.loader.exec_module(conf)
 
diff --git a/yardang/wiki.py b/yardang/wiki.py
index 1568bbb0..de787522 100644
--- a/yardang/wiki.py
+++ b/yardang/wiki.py
@@ -452,7 +452,7 @@ def _is_api_page(filename: str, content: str) -> bool:
     return indicator_count >= 2
 
 
-def extract_toctree_entries(content: str) -> list[tuple[str, str]]:
+def extract_toctree_entries(content: str) -> list[tuple[str | None, str]]:
     """Extract toctree entries from markdown content.
 
     Parses MyST-style toctree directives to find linked pages.