release: v0.35.0 [skip ci]

- Add check_single_h1: each markdown file should have at most one H1
- Add check_max_heading_depth: headings should not exceed H4 (configurable)
- Add check_line_length: warn on lines >120 chars (non-blocking — badge URLs)
- Add check_code_block_languages: fenced code blocks must specify a language
- Add check_orphan_docs: warn on docs not linked from index.md or mapping.json
- Fix all code blocks in docs to specify language (text for plain blocks)
- Fix duplicate H1 in .vale/styles/devx/README.md
- Add 18 new tests for full coverage of new checks

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

.vale/styles/devx/README.md

@@ -1,2 +1,3 @@
 # Custom Vale style for devx documentation
-# Project-specific terminology and style rules
+
+Project-specific terminology and style rules

.vale/styles/write-good/README.md

@@ -2,7 +2,7 @@ Based on [write-good](https://github.com/btford/write-good).
 
 > Naive linter for English prose for developers who can't write good and wanna learn to do other stuff good too.
 
-```
+```text
 The MIT License (MIT)
 
 Copyright (c) 2014 Brian Ford

AGENTS.md

@@ -57,7 +57,7 @@ devx is a reusable Python package providing development and CI/CD tools for obla
 
 ### Package Structure
 
-```
+```text
 src/devx/
 ├── __init__.py          # Version (single source of truth, read by setuptools)
 ├── cli.py               # Click-based CLI entry point (devx command)
@@ -158,7 +158,7 @@ git checkout -b DEVX-N-short-description
 
 ### 4. Commit (Conventional Commits)
 Branch commits use conventional commit format (no `DEVX-N:` prefix):
-```
+```text
 feat: add new feature
 fix: resolve bug
 docs: update README

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 All notable changes to this project will be documented in this file.
 
+## [0.35.0] - 2026-07-06
+
+### Features
+
+- Enrich lint_docs.py with single H1, max depth, line length, code block lang, orphan checks
+
 ## [0.34.0] - 2026-07-06
 
 ### Features

README.md

@@ -87,7 +87,7 @@ extra index and list devx in your dependencies:
 ```toml
 [project]
 dependencies = [
-    "devx>=0.34.0",
+    "devx>=0.35.0",
 ]
 
 [tool.pip]
@@ -101,8 +101,8 @@ pip install -e .
 ```
 
 > **Note:** If your project requires a specific devx version, pin it in
-> `dependencies` (for example, `"devx==0.34.0"`) or use a version constraint
-> (for example, `"devx>=0.34.0,<0.35"`).
+> `dependencies` (for example, `"devx==0.35.0"`) or use a version constraint
+> (for example, `"devx>=0.35.0,<0.36"`).
 
 ### Optional extras
 
@@ -434,7 +434,7 @@ devx is a self-contained Python package under `src/devx/`. It never imports
 from scripts outside the package. All tools are invoked via
 `python -m devx.ci.*`, `python -m devx.tools.*`, or `python -m devx.molecule.*`.
 
-```
+```text
 src/devx/
 ├── __init__.py          # Version (single source of truth, read by setuptools)
 ├── cli.py               # Click-based CLI entry point (devx command)

docs/index.md

@@ -74,14 +74,14 @@ Add devx to your `pyproject.toml` dependencies and configure the registry:
 ```toml
 [project]
 dependencies = [
-    "devx>=0.34.0",
+    "devx>=0.35.0",
 ]
 
 [tool.pip]
 extra-index-url = "https://git.oblachno.oblachno.fyi/api/packages/oblachno-oss/pypi/simple"
 ```
 
-Pin a specific version if needed: `"devx==0.34.0"` or `"devx>=0.34.0,<0.35"`.
+Pin a specific version if needed: `"devx==0.35.0"` or `"devx>=0.35.0,<0.36"`.
 
 ### Optional extras
 

docs/tech/architecture.md

@@ -6,7 +6,7 @@ from scripts outside the package.
 
 ## Package structure
 
-```
+```text
 src/devx/
 ├── __init__.py              # Version (single source of truth, read by setuptools)
 ├── cli.py                   # Click-based CLI entry point (devx command)
@@ -439,7 +439,7 @@ v2 failures. Supports loading custom platforms from a JSON file.
 
 ### PR lifecycle
 
-```
+```text
 Developer creates Vikunja task (DEVX-N)
     │
     ▼
@@ -475,7 +475,7 @@ CI workflow (ci.yml) triggers:
 
 ### Post-merge flow
 
-```
+```text
 Push to master (squash-merge commit: "DEVX-N <conventional commit>")
     │
     ▼
@@ -519,7 +519,7 @@ Post-merge workflow (post-merge.yml) triggers:
 
 ### Publish flow
 
-```
+```text
 Tag push (vX.Y.Z) triggers publish workflow (publish.yml):
     │
     ▼
@@ -536,7 +536,7 @@ Tag push (vX.Y.Z) triggers publish workflow (publish.yml):
 
 ### Badge generation flow
 
-```
+```text
 push_badges.py:
     │
     ├── fetch_latest_master() → git fetch + reset --hard origin/master

docs/tech/ci-cd-workflow.md

@@ -6,7 +6,7 @@ tag-triggered publishing.
 
 ## Workflow overview
 
-```
+```text
 PR opened/synchronized ──► CI (ci.yml)
     │                         ├── quality
     │                         ├── detect-changes
@@ -143,7 +143,7 @@ updates.
 
 ### Job dependency graph
 
-```
+```text
 detect-type ──┬── validate-commit-msg (skip if release commit)
               ├── release (skip if release commit)
               │       │

docs/user/getting-started.md

@@ -48,12 +48,12 @@ Add devx to your `pyproject.toml`:
 ```toml
 [project]
 dependencies = [
-    "devx>=0.34.0",
+    "devx>=0.35.0",
 ]
 
 [project.optional-dependencies]
 dev = [
-    "devx>=0.34.0",
+    "devx>=0.35.0",
 ]
 ```
 
@@ -72,7 +72,7 @@ tea CLI, etc.) and configure pre-commit hooks.
 
 devx expects a `docs/` directory with at minimum:
 
-```
+```text
 docs/
 ├── index.md          # Documentation home page
 ├── mapping.json      # Wiki page title mappings

src/devx/__init__.py

@@ -1,3 +1,3 @@
 """devx — reusable development and CI/CD tools for oblachno-oss projects."""
 
-__version__ = "0.34.0"
+__version__ = "0.35.0"

src/devx/ci/lint_docs.py

@@ -7,6 +7,12 @@ Checks performed (all configurable via pyproject.toml ``[tool.devx.docs]``):
 - **Broken internal links**: relative paths and anchors in markdown files
   must resolve to actual files and headings.
 - **Heading hierarchy**: no skipping heading levels (e.g., ``#`` → ``###``).
+- **Single H1**: each markdown file should have at most one H1 heading.
+- **Max heading depth**: headings should not exceed H4 (configurable).
+- **Max line length**: lines should not exceed 120 characters (configurable).
+- **Code block language**: fenced code blocks should specify a language.
+- **Orphan docs**: docs not linked from index.md or mapping.json (warning).
+- **Mapping completeness**: all docs/*.md should be in mapping.json (warning).
 - **TODO/FIXME**: flags leftover TODO/FIXME markers in documentation.
 - **Stale docs**: files not modified in >180 days (warning only).
 - **Trailing whitespace**: lines should not end with whitespace.
@@ -49,6 +55,15 @@ REQUIRED_DOC_FILES = ["index.md"]
 # Maximum age for docs before they're considered stale (days)
 STALE_THRESHOLD_DAYS = 180
 
+# Maximum heading depth (H4 by default)
+MAX_HEADING_DEPTH = 4
+
+# Maximum line length
+MAX_LINE_LENGTH = 120
+
+# Code block without language: ``` followed by optional whitespace only
+_CODE_BLOCK_NO_LANG_RE = re.compile(r"^```[ \t]*$", re.MULTILINE)
+
 # Files excluded from duplicate heading checks (auto-generated or structured
 # with repeated subsections under different parent sections)
 DUPLICATE_HEADING_EXCLUDES = {
@@ -318,6 +333,120 @@ def check_duplicate_headings(root: Path) -> list[str]:
     return issues
 
 
+def check_single_h1(root: Path) -> list[str]:
+    """Check that each markdown file has at most one H1 heading."""
+    issues: list[str] = []
+    md_files = [f for f in root.rglob("*.md") if not any(part in _EXCLUDE_DIRS for part in f.parts)]
+
+    for md_file in md_files:
+        rel_path = md_file.relative_to(root)
+        if md_file.name in DUPLICATE_HEADING_EXCLUDES:
+            continue
+        content = strip_code_blocks(md_file.read_text(encoding="utf-8"))
+        h1_count = len(re.findall(r"^#\s+", content, re.MULTILINE))
+        if h1_count > 1:
+            issues.append(f"{rel_path}: {h1_count} H1 headings — should have at most 1")
+
+    return issues
+
+
+def check_max_heading_depth(root: Path) -> list[str]:
+    """Check that headings don't exceed MAX_HEADING_DEPTH."""
+    issues: list[str] = []
+    md_files = [f for f in root.rglob("*.md") if not any(part in _EXCLUDE_DIRS for part in f.parts)]
+
+    for md_file in md_files:
+        rel_path = md_file.relative_to(root)
+        content = strip_code_blocks(md_file.read_text(encoding="utf-8"))
+        for match in re.finditer(r"^(#{1,6})\s+", content, re.MULTILINE):
+            level = len(match.group(1))
+            if level > MAX_HEADING_DEPTH:
+                line_num = content[: match.start()].count("\n") + 1
+                issues.append(f"{rel_path}:{line_num}: heading depth H{level} exceeds max H{MAX_HEADING_DEPTH}")
+
+    return issues
+
+
+def check_line_length(root: Path) -> list[str]:
+    """Check that no lines exceed MAX_LINE_LENGTH characters."""
+    issues: list[str] = []
+    md_files = [f for f in root.rglob("*.md") if not any(part in _EXCLUDE_DIRS for part in f.parts)]
+
+    for md_file in md_files:
+        rel_path = md_file.relative_to(root)
+        content = md_file.read_text(encoding="utf-8")
+        for i, line in enumerate(content.splitlines(), 1):
+            if len(line) > MAX_LINE_LENGTH:
+                issues.append(f"{rel_path}:{i}: line too long ({len(line)} > {MAX_LINE_LENGTH} chars)")
+
+    return issues
+
+
+def check_code_block_languages(root: Path) -> list[str]:
+    """Check that fenced code blocks specify a language."""
+    issues: list[str] = []
+    md_files = [f for f in root.rglob("*.md") if not any(part in _EXCLUDE_DIRS for part in f.parts)]
+
+    for md_file in md_files:
+        rel_path = md_file.relative_to(root)
+        content = md_file.read_text(encoding="utf-8")
+        in_code_block = False
+        for i, line in enumerate(content.splitlines(), 1):
+            stripped = line.strip()
+            if stripped.startswith("```"):
+                if not in_code_block:
+                    # Opening fence — check for language
+                    if _CODE_BLOCK_NO_LANG_RE.match(line):
+                        issues.append(f"{rel_path}:{i}: code block without language specifier")
+                    in_code_block = True
+                else:
+                    # Closing fence
+                    in_code_block = False
+
+    return issues
+
+
+def check_orphan_docs(root: Path, docs_dir: Path) -> list[str]:
+    """Check for docs not linked from index.md or mapping.json (warnings)."""
+    issues: list[str] = []
+    if not docs_dir.is_dir():
+        return issues
+
+    # Collect all referenced files from index.md and mapping.json
+    referenced: set[str] = set()
+    index_file = docs_dir / "index.md"
+    if index_file.exists():
+        content = index_file.read_text(encoding="utf-8")
+        for match in _LINK_RE.finditer(content):
+            url = match.group(2).strip()
+            if not url.startswith(("http://", "https://", "mailto:")):
+                referenced.add(url.split("#")[0])
+
+    mapping_file = docs_dir / "mapping.json"
+    if mapping_file.exists():
+        try:
+            mapping = json.loads(mapping_file.read_text(encoding="utf-8"))
+            if isinstance(mapping, dict):
+                # Add both keys (filenames) and values (wiki page names)
+                for k, v in mapping.items():
+                    if isinstance(k, str):
+                        referenced.add(k)
+                    if isinstance(v, str):
+                        referenced.add(v)
+        except (json.JSONDecodeError, AttributeError):
+            pass
+
+    # Check each doc file
+    for md_file in sorted(docs_dir.rglob("*.md")):
+        if md_file.name == "index.md":
+            continue
+        rel_path = md_file.relative_to(docs_dir).as_posix()
+        if rel_path not in referenced and md_file.name not in referenced:
+            issues.append(f"docs/{rel_path}: orphan doc — not linked from index.md or mapping.json")
+
+    return issues
+
+
 @click.command()
 @click.option("--root", default=".", help="Repository root directory.")
 @click.option("--docs-dir", default=None, help="Docs directory (default: <root>/docs).")
@@ -327,6 +456,11 @@ def check_duplicate_headings(root: Path) -> list[str]:
 @click.option("--check-stale/--no-check-stale", default=False, help="Check for stale docs.")
 @click.option("--check-trailing/--no-check-trailing", default=True, help="Check trailing whitespace.")
 @click.option("--check-duplicates/--no-check-duplicates", default=True, help="Check duplicate headings.")
+@click.option("--check-single-h1/--no-check-single-h1", "single_h1", default=True, help="Check single H1 per file.")
+@click.option("--check-depth/--no-check-depth", "depth", default=True, help="Check max heading depth.")
+@click.option("--check-line-length/--no-check-line-length", "line_length", default=True, help="Check line length.")
+@click.option("--check-code-lang/--no-check-code-lang", "code_lang", default=True, help="Check code block languages.")
+@click.option("--check-orphans/--no-check-orphans", "orphans", default=False, help="Check for orphan docs (warnings).")
 @click.option("--fix", is_flag=True, default=False, help="Auto-fix trailing whitespace.")
 def main(
     root: str,
@@ -337,6 +471,11 @@ def main(
     check_stale: bool,
     check_trailing: bool,
     check_duplicates: bool,
+    single_h1: bool,
+    depth: bool,
+    line_length: bool,
+    code_lang: bool,
+    orphans: bool,
     fix: bool,
 ) -> None:
     """Lint documentation files for structure, links, and quality."""
@@ -369,6 +508,31 @@ def main(
         click.echo(_("Checking duplicate headings..."))
         all_issues.extend(check_duplicate_headings(root_path))
 
+    # Single H1
+    if single_h1:
+        click.echo(_("Checking single H1 per file..."))
+        all_issues.extend(check_single_h1(root_path))
+
+    # Max heading depth
+    if depth:
+        click.echo(_("Checking max heading depth..."))
+        all_issues.extend(check_max_heading_depth(root_path))
+
+    # Line length (warnings — badge URLs and tables can exceed 120)
+    if line_length:
+        click.echo(_("Checking line length..."))
+        ll_issues = check_line_length(root_path)
+        for issue in ll_issues[:10]:  # Show first 10 only
+            click.echo(f"  WARN: {issue}")
+        if len(ll_issues) > 10:
+            click.echo(_("  ... and {n} more", n=len(ll_issues) - 10))
+        click.echo(_("  {n} long lines found (warnings only)", n=len(ll_issues)))
+
+    # Code block languages
+    if code_lang:
+        click.echo(_("Checking code block languages..."))
+        all_issues.extend(check_code_block_languages(root_path))
+
     # TODO/FIXME
     if check_todo:
         click.echo(_("Checking for TODO/FIXME markers..."))
@@ -391,15 +555,22 @@ def main(
         else:
             all_issues.extend(ws_issues)
 
-    # Stale docs
+    # Stale docs (warnings)
     if check_stale:
         click.echo(_("Checking for stale docs..."))
         stale = check_stale_docs(root_path)
         for issue in stale:
             click.echo(f"  WARN: {issue}")
-        # Stale docs are warnings, not errors
         click.echo(_("  {n} stale docs found (warnings only)", n=len(stale)))
 
+    # Orphan docs (warnings)
+    if orphans:
+        click.echo(_("Checking for orphan docs..."))
+        orphan_issues = check_orphan_docs(root_path, docs_path)
+        for issue in orphan_issues:
+            click.echo(f"  WARN: {issue}")
+        click.echo(_("  {n} orphan docs found (warnings only)", n=len(orphan_issues)))
+
     # Report
     click.echo(f"\n{'=' * 60}")
     if all_issues:

tests/unit/test_lint_docs.py

@@ -9,11 +9,16 @@ from pathlib import Path
 from click.testing import CliRunner
 
 from devx.ci.lint_docs import (
+    check_code_block_languages,
     check_docs_structure,
     check_duplicate_headings,
     check_heading_hierarchy,
     check_internal_links,
+    check_line_length,
+    check_max_heading_depth,
+    check_orphan_docs,
     check_required_files,
+    check_single_h1,
     check_stale_docs,
     check_todo_fixme,
     check_trailing_whitespace,
@@ -362,6 +367,100 @@ class TestCheckDuplicateHeadings:
         assert issues == []
 
 
+class TestCheckSingleH1:
+    def test_single_h1_ok(self, tmp_path: Path) -> None:
+        (tmp_path / "README.md").write_text("# Title\n## Section\n")
+        issues = check_single_h1(tmp_path)
+        assert issues == []
+
+    def test_multiple_h1_fails(self, tmp_path: Path) -> None:
+        (tmp_path / "README.md").write_text("# Title 1\n# Title 2\n")
+        issues = check_single_h1(tmp_path)
+        assert len(issues) == 1
+        assert "2 H1" in issues[0]
+
+    def test_no_h1_ok(self, tmp_path: Path) -> None:
+        (tmp_path / "README.md").write_text("## Section\n")
+        issues = check_single_h1(tmp_path)
+        assert issues == []
+
+
+class TestCheckMaxHeadingDepth:
+    def test_ok(self, tmp_path: Path) -> None:
+        (tmp_path / "README.md").write_text("# H1\n## H2\n### H3\n#### H4\n")
+        issues = check_max_heading_depth(tmp_path)
+        assert issues == []
+
+    def test_too_deep(self, tmp_path: Path) -> None:
+        (tmp_path / "README.md").write_text("# H1\n##### H5\n")
+        issues = check_max_heading_depth(tmp_path)
+        assert len(issues) == 1
+        assert "H5" in issues[0]
+
+
+class TestCheckLineLength:
+    def test_ok(self, tmp_path: Path) -> None:
+        (tmp_path / "README.md").write_text("# Short line\n")
+        issues = check_line_length(tmp_path)
+        assert issues == []
+
+    def test_too_long(self, tmp_path: Path) -> None:
+        (tmp_path / "README.md").write_text("# " + "x" * 200 + "\n")
+        issues = check_line_length(tmp_path)
+        assert len(issues) == 1
+        assert "202" in issues[0]
+
+
+class TestCheckCodeBlockLanguages:
+    def test_with_language(self, tmp_path: Path) -> None:
+        (tmp_path / "README.md").write_text("```python\nprint('hi')\n```\n")
+        issues = check_code_block_languages(tmp_path)
+        assert issues == []
+
+    def test_without_language(self, tmp_path: Path) -> None:
+        (tmp_path / "README.md").write_text("```\nplain text\n```\n")
+        issues = check_code_block_languages(tmp_path)
+        assert len(issues) == 1
+        assert "without language" in issues[0]
+
+    def test_closing_fence_not_flagged(self, tmp_path: Path) -> None:
+        (tmp_path / "README.md").write_text("```python\nprint('hi')\n```\n")
+        issues = check_code_block_languages(tmp_path)
+        assert issues == []
+
+
+class TestCheckOrphanDocs:
+    def test_no_orphans(self, tmp_path: Path) -> None:
+        docs = tmp_path / "docs"
+        docs.mkdir()
+        (docs / "index.md").write_text("# Home\n[link](page.md)\n")
+        (docs / "page.md").write_text("# Page\n")
+        issues = check_orphan_docs(tmp_path, docs)
+        assert issues == []
+
+    def test_orphan_found(self, tmp_path: Path) -> None:
+        docs = tmp_path / "docs"
+        docs.mkdir()
+        (docs / "index.md").write_text("# Home\n")
+        (docs / "page.md").write_text("# Page\n")
+        issues = check_orphan_docs(tmp_path, docs)
+        assert len(issues) == 1
+        assert "orphan" in issues[0]
+
+    def test_no_docs_dir(self, tmp_path: Path) -> None:
+        issues = check_orphan_docs(tmp_path, tmp_path / "docs")
+        assert issues == []
+
+    def test_referenced_in_mapping(self, tmp_path: Path) -> None:
+        docs = tmp_path / "docs"
+        docs.mkdir()
+        (docs / "index.md").write_text("# Home\n")
+        (docs / "mapping.json").write_text(json.dumps({"page.md": "Page"}))
+        (docs / "page.md").write_text("# Page\n")
+        issues = check_orphan_docs(tmp_path, docs)
+        assert issues == []
+
+
 class TestMain:
     def test_passes_clean_repo(self, tmp_path: Path) -> None:
         """A clean repo with all files should pass."""
@@ -434,3 +533,59 @@ class TestMain:
         # Stale docs are warnings, not errors
         assert result.exit_code == 0
         assert "stale" in result.output
+
+    def test_line_length_warning(self, tmp_path: Path) -> None:
+        """--check-line-length should warn but not fail."""
+        (tmp_path / "README.md").write_text("# " + "x" * 200 + "\n")
+        (tmp_path / "AGENTS.md").write_text("# AGENTS\n")
+        (tmp_path / "CHANGELOG.md").write_text("# Changelog\n")
+        docs = tmp_path / "docs"
+        docs.mkdir()
+        (docs / "index.md").write_text("# Home\n")
+        (docs / "mapping.json").write_text(json.dumps({"index.md": "Home"}))
+        runner = CliRunner()
+        result = runner.invoke(main, ["--root", str(tmp_path), "--check-line-length"])
+        assert result.exit_code == 0
+        assert "long lines" in result.output
+
+    def test_line_length_many_warnings(self, tmp_path: Path) -> None:
+        """More than 10 long lines should show '... and N more'."""
+        long_line = "x" * 200 + "\n"
+        (tmp_path / "README.md").write_text(long_line * 15)
+        (tmp_path / "AGENTS.md").write_text("# AGENTS\n")
+        (tmp_path / "CHANGELOG.md").write_text("# Changelog\n")
+        docs = tmp_path / "docs"
+        docs.mkdir()
+        (docs / "index.md").write_text("# Home\n")
+        (docs / "mapping.json").write_text(json.dumps({"index.md": "Home"}))
+        runner = CliRunner()
+        result = runner.invoke(main, ["--root", str(tmp_path), "--check-line-length"])
+        assert result.exit_code == 0
+        assert "more" in result.output
+
+    def test_orphan_docs_warning(self, tmp_path: Path) -> None:
+        """--check-orphans should warn but not fail."""
+        (tmp_path / "README.md").write_text("# Title\n")
+        (tmp_path / "AGENTS.md").write_text("# AGENTS\n")
+        (tmp_path / "CHANGELOG.md").write_text("# Changelog\n")
+        docs = tmp_path / "docs"
+        docs.mkdir()
+        (docs / "index.md").write_text("# Home\n")
+        (docs / "mapping.json").write_text(json.dumps({"index.md": "Home"}))
+        (docs / "orphan.md").write_text("# Orphan\n")
+        runner = CliRunner()
+        result = runner.invoke(main, ["--root", str(tmp_path), "--check-orphans"])
+        assert result.exit_code == 0
+        assert "orphan" in result.output
+
+    def test_orphan_docs_invalid_mapping(self, tmp_path: Path) -> None:
+        """Invalid mapping.json should not crash orphan check."""
+        docs = tmp_path / "docs"
+        docs.mkdir()
+        (docs / "index.md").write_text("# Home\n")
+        (docs / "mapping.json").write_text("invalid json{")
+        (docs / "page.md").write_text("# Page\n")
+        # Should not raise — just returns issues
+        issues = check_orphan_docs(tmp_path, docs)
+        assert len(issues) == 1
+        assert "orphan" in issues[0]