Remove the per-article topics fallback

AGENTS.md

@@ -10,7 +10,7 @@ Josselin Perrus's personal site: an Astro 7 static site served by Cloudflare Wor
 - The page background (`src/components/Background.astro`: the paper texture and the corner pattern) and the topic map (`TopicMap.astro`, inside the `Intro` of Home and About) are drawn on canvases from small images in `src/assets/background/`. `scripts/make-background.py` makes those images, from the map's land in `src/data/topic-map.json`; rerun it after changing either, and commit its output. The site loads no shader library.
 - `src/content/writing/`: git submodule of [meaningfool-writing](https://github.com/meaningfool/meaningfool-writing), which holds every article, activity log and image. Read its `AGENTS.md` before editing content.
 - `src/content.config.ts`: the content collection, built from `articles/*.md` and `daily-logs/*.md` in the submodule.
-- `src/pages/index.astro`: the home. Its Writing list holds the articles, not the activity logs, and picking a topic on the map shows only the articles about it. An article's topics are its `topics` frontmatter field (`customer-success`, `product`, `ai-agents`: each one that makes up 30% or more of it), or else its entry in `src/data/topics.ts`.
+- `src/pages/index.astro`: the home. Its Writing list holds the articles, not the activity logs, and picking a topic on the map shows only the articles about it. An article's topics are its `topics` frontmatter field (`customer-success`, `product`, `ai-agents`: each one that makes up 30% or more of it).
 - `src/pages/articles/[slug].astro`: the page of every article and activity log. The Markdown goes through the plugins in `src/lib/` set in `astro.config.mjs`: the `# Title` line is dropped, the headings are renumbered from h2, and `rehype-article.mjs` shapes figures, YouTube embeds (moved to youtube-nocookie.com) and tables for `src/styles/prose.css`. In a table, a row whose cells are all bold is highlighted, and a paragraph starting with `Table:` right after it, past a blank line, is its caption. An image alone in its paragraph is captioned with its title, or with its alt text when that has a space.
 - `src/data/projects.ts`: the projects, with their screenshots in `src/assets/projects/`, and which articles belong to each, by article id.
 - `docs/document-sharing.md`: how the encrypted portfolio links on `/documents/` work and how to create them.

src/content.config.ts

@@ -25,7 +25,8 @@ const writing = defineCollection({
     description: z.string().optional(),
     tags: z.array(z.string()).optional(),
     // The topics an article is about, each one 30% or more of it: customer-success, product, ai-agents. The home's
-    // topic map filters Writing with them. Articles without the field take theirs from src/data/topics.ts.
+    // topic map filters Writing with them. Activity logs don't need the field; the home warns about an article
+    // without it.
     topics: z.array(z.enum(TOPICS)).optional(),
   }),
 });

src/data/topics.ts

@@ -1,11 +1,9 @@
-// The site's three topics, the three orange dots of the topic map, and which of them each article is about. Picking a
-// topic on the home's map shows only the articles about it.
+// The site's three topics, the three orange dots of the topic map. Picking a topic on the home's map shows only the
+// articles about it.
 //
 // An article belongs to a topic when that topic makes up 30% or more of it, so it can belong to more than one. An
-// article's topics come from its `topics` frontmatter field in meaningfool-writing when it has one, for example
-// `topics: ["product", "ai-agents"]`. Until every article has that field, the list below gives the topics of the 18
-// articles the prototype read (docs/redesign/prototype/maps.js, the weights in each article's `w`), by article id.
-import type { CollectionEntry } from 'astro:content';
+// article's topics are its `topics` frontmatter field in meaningfool-writing, for example
+// `topics: ["product", "ai-agents"]`, which takes the ids below.
 import map from './topic-map.json';
 
 /** The topics' ids, which the map's dots carry and the frontmatter's `topics` field takes. */
@@ -19,36 +17,3 @@ if (map.topics.map(({ id }) => id).join() !== TOPICS.join()) {
 
 /** The topics' names, as the map shows them: "Customer success", "Product", "AI agents". */
 export const TOPIC_NAMES = Object.fromEntries(map.topics.map(({ id, name }) => [id, name])) as Record<Topic, string>;
-
-// The prototype's weights are [customer success, product, AI agents]; each topic at 0.3 or more is listed.
-const fromPrototype: Record<string, Topic[]> = {
-	'edit-collections-generative-ai': ['ai-agents'], // 0.1, 0.15, 0.75
-	'structured-extraction': ['ai-agents'], // 0.2, 0.1, 0.7
-	'thoughts-on-human-ai-collaboration': ['customer-success', 'product', 'ai-agents'], // 0.3, 0.3, 0.4
-	'detecting-bounding-boxes': ['ai-agents'], // 0.05, 0.1, 0.85
-	'agent-frameworks-for-the-rest-of-us': ['ai-agents'], // 0.05, 0.15, 0.8
-	'how-long-for-that-change': ['product'], // 0.15, 0.7, 0.15
-	'january-in-review': ['ai-agents'], // 0.05, 0.25, 0.7
-	'prolifics-and-frugals': ['product'], // 0.2, 0.7, 0.1
-	'the-slicing-fallacy': ['product'], // 0.25, 0.7, 0.05
-	'we-cant-stop-planning': ['product'], // 0.2, 0.75, 0.05
-	cost_of_change_is_agile_ceiling: ['product'], // 0.15, 0.75, 0.1
-	compounding_dev_process: ['product', 'ai-agents'], // 0.05, 0.5, 0.45
-	antigravity_is_onto_something: ['ai-agents'], // 0.05, 0.25, 0.7
-	'semi-async_valley_of_death': ['product', 'ai-agents'], // 0.1, 0.3, 0.6
-	'spec-driven-development-has-it-backwards': ['product', 'ai-agents'], // 0.1, 0.5, 0.4
-	'ai-engineer-paris-conference-notes': ['ai-agents'], // 0.05, 0.15, 0.8
-	'voice-ai-maven-course-notes': ['ai-agents'], // 0.05, 0.1, 0.85
-	'faster-answers-better-questions': ['customer-success', 'product'], // 0.3, 0.5, 0.2
-};
-
-/** An article's topics: its `topics` frontmatter field, or else the list above; undefined when it has neither. */
-export function topicsOf(article: CollectionEntry<'writing'>): Topic[] | undefined {
-	return article.data.topics ?? fromPrototype[article.id];
-}
-
-/** The ids in the list above that match no article, for example after an article's file was renamed. */
-export function unknownTopicIds(articleIds: Iterable<string>): string[] {
-	const ids = new Set(articleIds);
-	return Object.keys(fromPrototype).filter((id) => !ids.has(id));
-}

src/pages/index.astro

@@ -1,15 +1,16 @@
 ---
 // The home: the intro beside the topic map, then Projects and Writing. Writing lists the articles, newest first; the
 // activity logs aren't listed, but their pages keep their URLs. Picking an orange dot on the map shows only the
-// articles about its topic (src/data/topics.ts), and picking it again, or "Show all", shows them all again.
+// articles about its topic (each article's `topics` frontmatter field), and picking it again, or "Show all", shows
+// them all again.
 import { Image } from 'astro:assets';
 import { getCollection } from 'astro:content';
 import Layout from '../layouts/Layout.astro';
 import Intro from '../components/Intro.astro';
 import JsonLd from '../components/JsonLd.astro';
 import { projects, projectOf } from '../data/projects';
 import { profiles } from '../data/profiles';
-import { TOPIC_NAMES, topicsOf, unknownTopicIds } from '../data/topics';
+import { TOPIC_NAMES } from '../data/topics';
 import { newestFirst } from '../lib/sort-posts';
 import { readingMinutes } from '../lib/reading-time.mjs';
 import { HOME_INTRO, articlesOnly, plural } from '../lib/share';
@@ -19,11 +20,8 @@ const description =
 	"Josselin Perrus's site: a product manager in Paris building AI products with AI agents. His projects, and writing on customer success, product and AI agents.";
 
 const articles = articlesOnly(await getCollection('writing')).sort(newestFirst);
-for (const id of unknownTopicIds(articles.map((article) => article.id))) {
-	console.warn(`src/data/topics.ts gives topics to an article that doesn't exist: ${id}`);
-}
 const rows = articles.map((article) => {
-	const topics = topicsOf(article);
+	const topics = article.data.topics;
 	// At 30% or more, every article has at least one topic: three shares under 30% can't make a whole.
 	if (!topics?.length) console.warn(`"${article.id}" has no topics, so picking a topic on the home's map hides it: give it a topics field.`);
 	return {