new website setup

.github/workflows/check.yml

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+# Validates and builds every pull request, so a mistake shows up on the change
+# that caused it rather than after it reaches main.
+#
+# It builds as well as validates because validate.js checks metadata and file
+# relationships without executing components — a post body reading a document
+# that no longer exists passes validation and then dies during prerendering.
+# Compile errors and bad imports are the same class.
+#
+# Nothing is published from here; see deploy.yml.
+
+name: Check
+
+on:
+  pull_request:
+  # Lets you re-run the checks by hand from the Actions tab.
+  workflow_dispatch:
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+
+      # ci rather than install: installs exactly what package-lock.json records,
+      # so a dependency publishing a new compatible version can't change the
+      # result between runs of identical code.
+      - run: npm ci
+
+      # Warnings do not fail this. They describe unfinished work — a chart not
+      # yet exported, an image not yet quantised — which shouldn't block a
+      # branch. They print in the log; --strict is available if that changes.
+      - run: npm run validate
+
+      - run: npm run build

.github/workflows/deploy.yml

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+# Builds the site and publishes it to GitHub Pages.
+#
+# build/ is gitignored and never committed. This workflow builds it on a runner,
+# uploads it as a Pages artifact, and Pages serves that — GitHub's documentation:
+# "Pages serves uploaded artifacts rather than reading directly from the
+# repository." So the built files never become git objects.
+#
+# Requires Settings -> Pages -> Source set to "GitHub Actions", not "Deploy from
+# a branch". Without that, this runs and publishes nothing.
+
+name: Deploy
+
+on:
+  push:
+    branches: [main]
+    # Editing notes shouldn't redeploy the site.
+    paths-ignore:
+      - 'notes/**'
+      - '**.md'
+  workflow_dispatch:
+
+# What the workflow is allowed to do. id-token is required by deploy-pages.
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Two quick pushes shouldn't race to publish; the later one wins.
+concurrency:
+  group: pages
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+
+      - run: npm ci
+
+      # npm run build is validate.js, then vite build, then strip-css.js. A
+      # validation error exits non-zero, so the build stops, so the deploy job
+      # below never runs and whatever is already published stays online.
+      - run: npm run build
+
+      - uses: actions/upload-pages-artifact@v3
+        with:
+          path: build
+
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - id: deployment
+        uses: actions/deploy-pages@v4

.gitignore

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+local_data
+node_modules
+build
+notes
+.ipynb_checkpoints
+.claude
+.DS_Store
+.vscode
+.svelte-kit
+.env
+.env.*
+!.env.example
+!.env.test
+vite.config.js.timestamp-*
+vite.config.ts.timestamp-*

LICENSE

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+Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International Public License
+
+By exercising the Licensed Rights (defined below), You accept and agree to be bound by the terms and conditions of this Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International Public License ("Public License").
+
+You can read the full license text at:
+https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode
+
+Summary (not a substitute for the full license):
+
+You are free to:
+- Share — copy and redistribute the material in any medium or format
+- Adapt — remix, transform, and build upon the material
+
+Under the following terms:
+- Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made.
+- NonCommercial — You may not use the material for commercial purposes.
+- ShareAlike — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.
+
+No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.

jsconfig.json

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+{
+	"extends": "./.svelte-kit/tsconfig.json",
+	"compilerOptions": {
+		"allowJs": true,
+		"checkJs": false,
+		"moduleResolution": "bundler"
+	},
+	"include": [
+		".svelte-kit/ambient.d.ts",
+		".svelte-kit/non-ambient.d.ts",
+		".svelte-kit/types/**/$types.d.ts",
+		"vite.config.js",
+		"svelte.config.js",
+		"src/**/*.js",
+		"src/**/*.svelte",
+		"posts/**/*.js",
+		"posts/**/*.svelte",
+		"scripts/**/*.js"
+	]
+}