Fix WASM build and add CI check for env imports

- Fix tree_sitter_rust extern to use tree_sitter_rust_orchard (matches C symbol)
- Add stdio.c stub to tree-sitter build for WASM targets
- Add CI step to verify no env imports in WASM modules

Author: fasterthanlime

.github/workflows/ci.yml

@@ -73,9 +73,29 @@ jobs:
 
       - uses: Swatinem/rust-cache@v2
 
+      - name: Install wabt
+        run: sudo apt-get update && sudo apt-get install -y wabt
+
       - name: Build for WASM
         run: cargo build --target wasm32-unknown-unknown --features wasm-fix
 
+      - name: Check for env imports in WASM
+        run: |
+          # Find all .wasm files and check for env imports
+          found_env_imports=false
+          for wasm_file in $(find target/wasm32-unknown-unknown -name "*.wasm" -type f); do
+            if wasm-objdump -j Import -x "$wasm_file" 2>/dev/null | grep -q '<- env\.'; then
+              echo "ERROR: Found env imports in $wasm_file:"
+              wasm-objdump -j Import -x "$wasm_file" | grep '<- env\.'
+              found_env_imports=true
+            fi
+          done
+          if [ "$found_env_imports" = true ]; then
+            echo "WASM modules should not have env imports - these won't work in the browser"
+            exit 1
+          fi
+          echo "No env imports found - WASM modules are browser-compatible"
+
   clippy:
     runs-on: depot-ubuntu-24.04-8
     steps: