fix: rename evergreeSince frontmatter key to evergreen-since

Consistent kebab-case across all article files, eleventy.config.js
collection filter, and garden.njk template. Adds missing evergreen-since
to mediale-subjektivierungsordnung and anarchistische-anthropologie so
they appear in Recently Evergreened.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

content/articles/anarchistische-anthropologie.md

@@ -5,6 +5,7 @@ category:
   - lang/de
   - anarchy
 gardenStage: evergreen
+evergreen-since: 2026-04-23T09:18:50
 visibility: private
 aiTextLevel: "0"
 updated: 2026-04-23T07:18:47.100Z

content/articles/du-machst-es-dir-aber.md

@@ -5,7 +5,7 @@ category:
   - lang/de
   - on/polyamory
 gardenStage: evergreen
-evergreeSince: 2024-03-03
+evergreen-since: 2024-03-03
 visibility: Public
 webmentionResults:
   sent: 0

content/articles/for-the-love-of-obsidian.md

@@ -48,7 +48,7 @@ aiCodeLevel: "2"
 aiDescription: Claude built the Obsidian Plugin
 aiTextLevel: "1"
 aiTools: Claude
-evergreeSince: 2026-03-14
+evergreen-since: 2026-03-14
 mpUrl: https://blog.giersig.eu/articles/for-the-love-of-obsidian/
 permalink: /articles/for-the-love-of-obsidian/
 ---

content/articles/mediale-subjektivierungsordnung.md

@@ -2,6 +2,7 @@
 date: 2026-04-20T07:16:46.000Z
 title: Mediale Subjektivierungsordnung
 gardenStage: evergreen
+evergreen-since: 2026-04-23T09:16:49
 visibility: Public
 aiTextLevel: "1"
 webmentionResults:

content/articles/murnauer-dialektik.md

@@ -22,7 +22,7 @@ updated: 2026-03-23T18:22:45.031Z
 aiCodeLevel: "0"
 aiTextLevel: "0"
 gardenStage: evergreen
-evergreeSince: 2024-12-31
+evergreen-since: 2024-12-31
 mpUrl: https://blog.giersig.eu/articles/murnauer-dialektik/
 permalink: /articles/murnauer-dialektik/
 ---

content/articles/perspektiven-auf-die-corona-demos.md

@@ -23,7 +23,7 @@ aiCodeLevel: "0"
 aiTextLevel: "0"
 gardenStage: evergreen
 related: https://blog.giersig.eu/articles/murnauer-dialektik/
-evergreeSince: 2020-08-06
+evergreen-since: 2020-08-06
 mpUrl: https://blog.giersig.eu/articles/perspektiven-auf-die-corona-demos/
 permalink: /articles/perspektiven-auf-die-corona-demos/
 ---

eleventy.config.js

@@ -1640,7 +1640,7 @@ export default function (eleventyConfig) {
   });
 
   // Posts that recently reached evergreen status (within the last 90 days).
-  // Requires evergreeSince frontmatter field, written by the Micropub plugin on first evergreen publish.
+  // Requires evergreen-since frontmatter field, written by the Micropub plugin on first evergreen publish.
   eleventyConfig.addCollection("recentEvergreens", function (collectionApi) {
     const cutoff = new Date();
     cutoff.setDate(cutoff.getDate() - 90);
@@ -1649,13 +1649,13 @@ export default function (eleventyConfig) {
       .filter(isPublished)
       .filter((item) => {
         if (item.data.gardenStage !== "evergreen") return false;
-        if (!item.data.evergreeSince) return false;
+        if (!item.data["evergreen-since"]) return false;
-        const d = new Date(item.data.evergreeSince);
+        const d = new Date(item.data["evergreen-since"]);
         return !isNaN(d.getTime()) && d >= cutoff;
       })
       .sort(
         (a, b) =>
-          new Date(b.data.evergreeSince) - new Date(a.data.evergreeSince),
+          new Date(b.data["evergreen-since"]) - new Date(a.data["evergreen-since"]),
       );
   });
 

garden.njk

@@ -60,7 +60,7 @@ pagefindIgnore: true
             </h3>
             <div class="flex items-center gap-3 text-xs text-surface-500 dark:text-surface-400">
               <span>🌳 Evergreen since
-                <time datetime="{{ post.data.evergreeSince }}">{{ post.data.evergreeSince }}</time>
+                <time datetime="{{ post.data['evergreen-since'] }}">{{ post.data['evergreen-since'] }}</time>
               </span>
             </div>
             {% if post.data.summary or post.data.description %}