fix: build all workspace members in release workflow

The release workflow only built the root package, missing the silo
binary. Add --workspace flag so all crates are compiled.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: danielkov

.github/workflows/release.yml

@@ -61,7 +61,7 @@ jobs:
           target: ${{ matrix.target }}
 
       - name: Build
-        run: cargo build --release --target ${{ matrix.target }}
+        run: cargo build --workspace --release --target ${{ matrix.target }}
 
       - name: Create Silo.app bundle
         if: runner.os == 'macOS'