Windows build links ole32; CI cross-builds Windows on main/develop; docs

- os.user_data_dir needs ole32.lib on Windows
- Build workflow gets a Windows cross-build job with a cached SDK
- Drop the backtick from Jua's codepoints (the font lacks it)
- Update AGENTS.md and README for decks, controls, scores and layout

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitea/workflows/gitea-build.yaml

@@ -1,7 +1,8 @@
 #
 # .gitea/workflows/gitea-build.yaml
 #
-# Checks, tests and builds on every push and pull request to main and develop.
+# Checks, tests and builds (Linux, plus a Windows cross-build) on every push and
+# pull request to main and develop.
 #
 
 name: "Build and Test"
@@ -31,3 +32,32 @@ jobs:
 
       - name: Build
         run: just release
+
+  # Cross-compiles for Windows so link breakages show up before a release
+  windows:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+
+      - name: Setup Toolchain
+        uses: ./.gitea/actions/setup
+        with:
+          packages: lld zip
+
+      - name: Cache Windows SDK
+        uses: actions/cache@v4
+        with:
+          path: |
+            build/xwin
+            build/xwin-sdk
+            build/raylib-windows
+          key: windows-sdk-${{ hashFiles('justfile') }}
+
+      - name: Windows Build
+        run: |
+          # Debian/Ubuntu may only ship a versioned lld-link
+          LLD_LINK="$(command -v lld-link || ls /usr/lib/llvm-*/bin/lld-link | sort -V | tail -1)"
+          export LLD_LINK
+          just windows-deps
+          just windows