davidbudzynski · davidbudzynski · Sep 7, 2026 · Sep 7, 2026 · Sep 7, 2026 · Sep 7, 2026
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
@@ -0,0 +1,36 @@
+name: tests
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  site-checks:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      # Stdlib only (minitest + yaml) — no `bundle install` needed,
+      # so this stays fast.
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.4"
+      - run: ruby -Itests tests/test_site.rb
+
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.4"
+          bundler-cache: true
+      # --strict-front-matter fails on YAML errors; --future also
+      # compiles scheduled posts so broken Liquid/post_url in them
+      # surfaces now instead of on their go-live date.
+      - run: bundle exec jekyll build --strict-front-matter --future
+      # Internal links, images, and alt text only — external URLs are
+      # left out to keep PR checks deterministic (no network flakiness).
+      # Installed outside the Gemfile on purpose: production (GitHub
+      # Pages) must keep the exact github-pages gem set.
+      - run: gem install html-proofer --no-document
+      - run: htmlproofer ./_site --disable-external --allow-hash-href
diff --git a/.gitignore b/.gitignore
@@ -3,3 +3,5 @@ _site
 .jekyll-cache
 .jekyll-metadata
 vendor
+.DS_Store
+__pycache__/
diff --git a/404.html b/404.html
@@ -22,4 +22,6 @@ <h1>404</h1>
 
   <p><strong>Page not found :(</strong></p>
   <p>The requested page could not be found.</p>
+  <p><a href="{{ "/" | relative_url }}">Back to home</a></p>
+  <p>Or browse the <a href="{{ "/archive/" | relative_url }}">archive</a> and <a href="{{ "/tags/" | relative_url }}">tags</a>.</p>
 </div>
diff --git a/Gemfile.lock b/Gemfile.lock
@@ -225,7 +225,7 @@ GEM
       gemoji (>= 3, < 5)
       html-pipeline (~> 2.2)
       jekyll (>= 3.0, < 5.0)
-    json (2.21.2)
+    json (3.0.0)
     kramdown (2.4.0)
       rexml
     kramdown-parser-gfm (1.1.0)
@@ -386,7 +386,7 @@ CHECKSUMS
   jekyll-titles-from-headings (0.5.3) sha256=77366754e361ea7b5d87881f5b1380835f5ce910c240a4d9ac2d7afe86d28481
   jekyll-watch (2.2.1) sha256=bc44ed43f5e0a552836245a54dbff3ea7421ecc2856707e8a1ee203a8387a7e1
   jemoji (0.13.0) sha256=5d4c3e8e2cbbb2b73997c31294f6f70c94e4d4fade039373e86835bcf5529e7c
-  json (2.21.2) sha256=1f1d3b7cf2b3ba1a69beca0bb6db13d5438b80bff3cd54cdaaa620b9b07c1c6a
+  json (3.0.0) sha256=1ff82a28c05c5cc7b646f3e3a3ac710e4ae2aa933690cba12f1f650b0ecdeb99
   kramdown (2.4.0) sha256=b62e5bcbd6ea20c7a6730ebbb2a107237856e14f29cebf5b10c876cc1a2481c5
   kramdown-parser-gfm (1.1.0) sha256=fb39745516427d2988543bf01fc4cf0ab1149476382393e0e9c48592f6581729
   liquid (4.0.4) sha256=4fcfebb1a045e47918388dbb7a0925e7c3893e58d2bd6c3b3c73ec17a2d8fdb3

diff --git a/LICENSE.md b/LICENSE.md
diff --git a/README.md b/README.md
@@ -5,6 +5,13 @@ It's a simple Jekyll-powered site, that I deploy on GitHub pages.
 
 Feel free to send PRs addressing typos, bad grammar, visual glitches, etc.
 
+## License
+
+Site code and fenced code examples in posts are [GPLv3 or later](LICENSE.md).
+Post prose and images are © David Budzyński, shared under
+[CC BY-NC-ND 4.0](https://creativecommons.org/licenses/by-nc-nd/4.0/).
+See [LICENSE.md](LICENSE.md) for details.
+
 To run the site locally, you need to have Ruby installed (macOS and Linux are
 both supported). Then run the following commands:
 

diff --git a/_config.yml b/_config.yml
@@ -20,6 +20,8 @@
 
 title: David Budzyński
 author: David Budzyński
+lang: en-GB
+timezone: Europe/London
 # email: your-email@example.com
 description: >- # this means to ignore newlines until "baseurl:"
   This is my blog where I share my thoughts on statistics, computer science, software, and technology.
@@ -28,12 +30,42 @@ url: "https://davidbudzynski.github.io" # the base hostname & protocol for your
 github_username: davidbudzynski
 rss: RSS
 
+# Explicit permalink without :categories so URLs stay stable even if a
+# category ever slips back into front matter.
+permalink: /:year/:month/:day/:title.html
+# Scheduled posts (future-dated) stay hidden until their date — intentional.
+future: false
+excerpt_separator: <!--more-->
+show_excerpts: true
+
+header_pages:
+  - about.md
+  - projects.md
+  - archive.md
+  - tags.html
+  - search.md
+
+minima:
+  # NOTE: github-pages pins minima 2.5.1, which ignores `skin`.
+  # Kept as forward-compat for minima 3.x (auto = light/dark by OS setting).
+  skin: auto
+  # Social icons on minima 2.5.x come from the legacy `github_username` /
+  # `rss` keys above via _includes/social.html, not from social_links.
+
+defaults:
+  - scope:
+      path: ""
+      type: posts
+    values:
+      layout: post
+
 # Build settings
 theme: minima
 plugins:
   - jekyll-feed
   - jekyll-sitemap
   - jekyll-seo-tag
+  - jekyll-redirect-from
 # Exclude from processing.
 # The following items will not be processed, by default.
 # Any item listed under the `exclude:` key here will be automatically added to
@@ -49,6 +81,7 @@ exclude:
   - Gemfile
   - Gemfile.lock
   - node_modules/
+  - tests/
   - vendor/bundle/
   - vendor/cache/
   - vendor/gems/

diff --git a/_drafts/agent-skills-i-like-using.md b/_drafts/agent-skills-i-like-using.md
@@ -5,4 +5,6 @@ tags   : [AI, Software, Tooling]
 ---
 
 A tour of the skills, tools, and capabilities I enable for my coding agent, and
-which ones I keep disabled.
+which ones I keep disabled.
+
+<!--more-->
diff --git a/_drafts/automating-boring-tasks.md b/_drafts/automating-boring-tasks.md
@@ -5,4 +5,6 @@ tags   : [Linux, Shell, Tooling]
 ---
 
 How I stop repeating myself: scripts and Makefiles for the chores that used to
-waste my time.
+waste my time.
+
+<!--more-->
diff --git a/_drafts/browser-extensions-that-respect-privacy.md b/_drafts/browser-extensions-that-respect-privacy.md
@@ -4,4 +4,6 @@ title  : "Browser extensions that respect your privacy"
 tags   : [Web, Privacy]
 ---
 
-The extensions I trust and use, and the ones I avoid.
+The extensions I trust and use, and the ones I avoid.
+
+<!--more-->
diff --git a/_drafts/firefox-customization-part-2.md b/_drafts/firefox-customization-part-2.md
@@ -5,4 +5,6 @@ tags   : [Web, Software, Privacy]
 ---
 
 A deeper dive into Firefox customization with userChrome.css examples, following
-up on the earlier Firefox post.
+up on the earlier Firefox post.
+
+<!--more-->
diff --git a/_drafts/five-years-in-linux.md b/_drafts/five-years-in-linux.md
@@ -5,4 +5,6 @@ tags   : [Linux]
 ---
 
 A retrospective on the original "Two Years in Linux" post, updated with what
-changed over the following years.
+changed over the following years.
+
+<!--more-->
diff --git a/_drafts/how-i-use-an-agent-day-to-day.md b/_drafts/how-i-use-an-agent-day-to-day.md
@@ -5,4 +5,6 @@ tags   : [AI, Software, Tooling]
 ---
 
 A realistic walkthrough of a session with my agent: from prompt to a reviewed,
-committed change, including where it shines and where it trips up.
+committed change, including where it shines and where it trips up.
+
+<!--more-->
diff --git a/_drafts/lessons-from-10-years-of-r.md b/_drafts/lessons-from-10-years-of-r.md
@@ -5,4 +5,6 @@ tags   : [R, Data Science]
 ---
 
 What a decade of R taught me about statistics, coding, and tooling. Advice I
-would give my younger self.
+would give my younger self.
+
+<!--more-->
diff --git a/_drafts/my-dotfiles-setup.md b/_drafts/my-dotfiles-setup.md
@@ -4,4 +4,6 @@ title  : "My dotfiles setup and how I manage them"
 tags   : [Linux, Tooling]
 ---
 
-How I structure, version, and sync my dotfiles across machines.
+How I structure, version, and sync my dotfiles across machines.
+
+<!--more-->
diff --git a/_drafts/my-python-setup-in-2026.md b/_drafts/my-python-setup-in-2026.md
@@ -5,4 +5,6 @@ tags   : [Python, Tooling]
 ---
 
 uv, ruff, pyright. Why I stopped caring about pip and venv, and how a modern
-Python setup looks in practice.
+Python setup looks in practice.
+
+<!--more-->
diff --git a/_drafts/program-spotlight-cli-tools.md b/_drafts/program-spotlight-cli-tools.md
@@ -5,4 +5,6 @@ tags   : [Software, CLI]
 ---
 
 Part of the Program Spotlight series (following rclone and file managers). Covers
-fzf, ripgrep, tmux, zoxide, and bat.
+fzf, ripgrep, tmux, zoxide, and bat.
+
+<!--more-->
diff --git a/_drafts/program-spotlight-paperless-ngx.md b/_drafts/program-spotlight-paperless-ngx.md
@@ -5,4 +5,6 @@ tags   : [Software, Self-hosting]
 ---
 
 Document management done right: OCR, tagging, and search. Part of the Program
-Spotlight series.
+Spotlight series.
+
+<!--more-->
diff --git a/_drafts/python-packages-beyond-pandas-numpy.md b/_drafts/python-packages-beyond-pandas-numpy.md
@@ -5,4 +5,6 @@ tags   : [Python, Data Science]
 ---
 
 A personal list of the Python packages I reach for constantly that most people
-never hear about.
+never hear about.
+
+<!--more-->
diff --git a/_drafts/self-hosting-paperless-ngx.md b/_drafts/self-hosting-paperless-ngx.md
@@ -5,4 +5,6 @@ tags   : [Self-hosting, Privacy]
 ---
 
 Paperless-ngx as a gateway into self-hosting: the setup, the payoff, and what
-came after.
+came after.
+
+<!--more-->
diff --git a/_drafts/using-rss-and-why-its-good.md b/_drafts/using-rss-and-why-its-good.md
@@ -5,4 +5,6 @@ tags   : [RSS, Web, Privacy]
 ---
 
 Why RSS is still the best way to follow what matters, and how to set up a
-reader that actually fits your life.
+reader that actually fits your life.
+
+<!--more-->
diff --git a/_drafts/what-is-agentic-coding.md b/_drafts/what-is-agentic-coding.md
@@ -5,4 +5,6 @@ tags   : [AI, Software, Tooling]
 ---
 
 A grounded introduction to agentic coding: what the tools actually do, their
-limits, and the hype vs. reality.
+limits, and the hype vs. reality.
+
+<!--more-->
diff --git a/_drafts/why-i-keep-this-blog.md b/_drafts/why-i-keep-this-blog.md
@@ -5,4 +5,6 @@ tags   : [Meta, Writing]
 ---
 
 Reflections on running a small Jekyll blog on GitHub Pages: the writing
-pipeline, what I get out of it, and why I keep going.
+pipeline, what I get out of it, and why I keep going.
+
+<!--more-->
diff --git a/_drafts/why-i-moved-my-r-workflow-to-python.md b/_drafts/why-i-moved-my-r-workflow-to-python.md
@@ -5,4 +5,6 @@ tags   : [R, Python, Data Science]
 ---
 
 Follow-up to "R is a Terrible Programming Language". What drove the migration,
-what I kept in R, and how the transition went in practice.
+what I kept in R, and how the transition went in practice.
+
+<!--more-->
diff --git a/_drafts/why-i-still-read-diffs.md b/_drafts/why-i-still-read-diffs.md
@@ -5,4 +5,6 @@ tags   : [AI, Software, Tooling]
 ---
 
 Agent-generated code still needs review. What I auto-accept, what I always
-rewrite, and how I keep my git hygiene intact.
+rewrite, and how I keep my git hygiene intact.
+
+<!--more-->
diff --git a/_drafts/why-i-use-a-tiling-window-manager.md b/_drafts/why-i-use-a-tiling-window-manager.md
@@ -5,4 +5,6 @@ tags   : [Linux, WM]
 ---
 
 The workflow and productivity argument for tiling window managers, based on my
-own daily setup.
+own daily setup.
+
+<!--more-->
diff --git a/_includes/footer.html b/_includes/footer.html
@@ -30,6 +30,13 @@
       </div>
     </div>
 
+    <div class="footer-license">
+      <p>© 2021–2026 David Budzyński. Prose and images:
+      <a href="https://creativecommons.org/licenses/by-nc-nd/4.0/">CC BY-NC-ND 4.0</a>.
+      Site code and code examples:
+      <a href="{{ "/LICENSE.md" | relative_url }}">GPLv3 or later</a>.</p>
+    </div>
+
   </div>
 
 </footer>
diff --git a/_includes/head.html b/_includes/head.html
@@ -3,7 +3,10 @@
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
   <meta name="viewport" content="width=device-width, initial-scale=1">
   {%- seo -%}
+  <meta name="theme-color" content="#fdfdfd" media="(prefers-color-scheme: light)">
+  <meta name="theme-color" content="#1a1a1a" media="(prefers-color-scheme: dark)">
   <link rel="stylesheet" href="{{ "/assets/main.css" | relative_url }}">
   <link rel="icon" href="{{ "/favicon.ico" | relative_url }}">
+  <link rel="apple-touch-icon" href="{{ "/favicon.ico" | relative_url }}">
   {%- feed_meta -%}
 </head>