doc: foxmash protocol in typst, display chars

.gitea/workflows/build-pdf.yml

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+name: Build and Release Typst PDF
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - 'v*' # Triggers when a release tag like v1.0.0 is pushed
+
+jobs:
+  build-pdf:
+    runs-on: host
+    steps:
+      # 1. Checkout the source code from Git
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+
+      # 2. Set up Typst CLI and compile the PDF
+      - name: Setup and Compile Typst
+        uses: chgrobold/action-typst@v3
+        with:
+          source: docs/lora/foxmesh-protocol.typ
+          output: docs/lora/FoxMesh_Protocol.pdf
+
+      # 3. Upload PDF as a Gitea artifact (runs on every push to main)
+      - name: Upload PDF Artifact
+        uses: actions/upload-artifact@v7
+        with:
+          name: Foxmesh-Protocol-pdf
+          path: docs/lora/FoxMesh_Protocol.pdf
+          retention-days: 14
+          archive: false
+
+      # 4. Optional: PDF direkt an ein Gitea-Release anhängen (wenn ein Tag gepusht wird)
+#      - name: Upload to Gitea Release
+#        if: startsWith(github.ref, 'refs/tags/')
+#        uses: svenstaro/upload-release-action@v2
+#        with:
+#          repo_token: ${{ secrets.GITHUB_TOKEN }}
+#          file: FoxMesh_Engineering_Manual.pdf
+#          asset_name: FoxMesh_Engineering_Manual.pdf
+#          tag: ${{ github.ref }}
+#          overwrite: true