[feat](trx-rs): add GitHub workflow to sync docs/ to wiki

Introduces a GitHub Actions workflow that mirrors the docs/ directory
to the repository wiki on every push to main that touches docs/. Also
supports manual dispatch via workflow_dispatch.

https://claude.ai/code/session_01Hs4BtTczFdXaggpzaHFfen
Signed-off-by: Claude <noreply@anthropic.com>

.github/workflows/wiki.yml

@@ -0,0 +1,39 @@
+name: Sync docs to Wiki
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'docs/**'
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  wiki:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Checkout wiki
+        uses: actions/checkout@v4
+        with:
+          repository: ${{ github.repository }}.wiki
+          path: wiki
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Sync docs to wiki
+        run: |
+          rsync -av --delete --exclude='.git' docs/ wiki/
+          cd wiki
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add -A
+          if git diff --cached --quiet; then
+            echo "No wiki changes to commit."
+          else
+            git commit -m "Sync docs from ${GITHUB_SHA::8}"
+            git push
+          fi