Update mkdocs to zensical

.github/workflows/documentation.yml

@@ -1,13 +1,14 @@
 name: documentation
 on:
   workflow_dispatch:
-
   pull_request:
     branches:
       - main
     paths:
       - "docs/**"
       - "mkdocs.yml"
+      - ".github/workflows/documentation.yml"
+
 permissions:
   contents: write
 jobs:
@@ -25,9 +26,13 @@ jobs:
       - run: echo "cache_id=$(date --utc '+%V')" >> $GITHUB_ENV
       - uses: actions/cache@v4
         with:
-          key: mkdocs-material-${{ env.cache_id }}
+          key: zensical-${{ env.cache_id }}
           path: .cache
           restore-keys: |
-            mkdocs-material-
-      - run: pip install mkdocs-material
-      - run: mkdocs gh-deploy --force
+            zensical-
+      - run: pip install zensical==0.0.46
+      - run: zensical build
+      - uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./site

AGENTS.md

@@ -29,7 +29,7 @@ android_kmp/
 
 ios/craftd-swiftui/     # iOS library (Swift Package + CocoaPods)
 flutter/craftd_widget/  # Flutter library (pub.dev)
-docs/                   # site documentation (MkDocs)
+docs/                   # site documentation (Zensical)
 ```
 
 Full module dependency graph → `ai/module-graph.md`