CI: add release build matrix and artifacts

Author: Codex

.github/workflows/ci.yml

@@ -11,12 +11,12 @@ env:
 
 jobs:
   build:
-    name: Lint and Test
+    name: Lint, Test, and Build (${{ matrix.os }})
     runs-on: ${{ matrix.os }}
     strategy:
-      fail-fast: false
-      matrix:
-        os: [ubuntu-latest, windows-latest]
+        fail-fast: false
+        matrix:
+          os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps:
       - name: Checkout
@@ -46,3 +46,15 @@ jobs:
 
       - name: Cargo test
         run: cargo test
+
+      - name: Cargo build (release)
+        run: cargo build --release
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: ollama-rename-${{ runner.os }}
+          path: |
+            target/release/ollama-rename.exe
+            target/release/ollama-rename
+          if-no-files-found: ignore