feat: add agor-pro commercial plugin crate and dual-repo infrastructure

agor-pro Tauri 2.x plugin (feature-gated via --features pro),
commercial Tauri config overlay, asymmetric test setup,
CI workflows (leak-check, commercial-build, PAT health),
pre-push hook, Makefile, CONTRIBUTING/MAINTENANCE/LICENSE-COMMERCIAL.

.github/workflows/leak-check.yml

@@ -0,0 +1,69 @@
+name: Leak Check
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  leak-check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Check for commercial directories
+        run: |
+          failed=0
+
+          # Check agor-pro/ exists
+          if [ -d "agor-pro/" ]; then
+            echo "::error::Commercial directory 'agor-pro/' found in community repo"
+            failed=1
+          fi
+
+          # Check src/lib/commercial/ has actual content (beyond .gitkeep)
+          if [ -d "src/lib/commercial/" ]; then
+            content_count=$(find src/lib/commercial/ -type f ! -name '.gitkeep' | wc -l)
+            if [ "$content_count" -gt 0 ]; then
+              echo "::error::Commercial code found in 'src/lib/commercial/' ($content_count files beyond .gitkeep)"
+              find src/lib/commercial/ -type f ! -name '.gitkeep'
+              failed=1
+            fi
+          fi
+
+          # Check tests/commercial/ has actual content (beyond .gitkeep)
+          if [ -d "tests/commercial/" ]; then
+            content_count=$(find tests/commercial/ -type f ! -name '.gitkeep' | wc -l)
+            if [ "$content_count" -gt 0 ]; then
+              echo "::error::Commercial test code found in 'tests/commercial/' ($content_count files beyond .gitkeep)"
+              find tests/commercial/ -type f ! -name '.gitkeep'
+              failed=1
+            fi
+          fi
+
+          if [ "$failed" -eq 1 ]; then
+            exit 1
+          fi
+          echo "No commercial directories with content found."
+
+      - name: Grep for commercial references in source
+        run: |
+          failed=0
+
+          for pattern in "LicenseRef-Commercial" "agor-pro" "agor_pro"; do
+            if grep -r --include="*.ts" --include="*.svelte" --include="*.rs" --include="*.toml" \
+                "$pattern" src/ src-tauri/src/ 2>/dev/null; then
+              echo "::error::Found '$pattern' reference in source code"
+              failed=1
+            fi
+          done
+
+          if [ "$failed" -eq 1 ]; then
+            echo "::error::Commercial references detected in community source. See above for details."
+            exit 1
+          fi
+          echo "No commercial references found in source."