ci: rename test job to python-ci and add success message job

Author: ya7010

.github/workflows/ci.yml

@@ -7,15 +7,16 @@ on:
     branches: [ main ]
 
 jobs:
-  test:
+  python-ci:
     runs-on: ubuntu-latest
     strategy:
       matrix:
         python-version:
           - '3.11.0'
           - '3.12.0'
           - '3.13.0'
-
+      fail-fast: false
+    name: Python CI (${{ matrix.python-version }})
     steps:
     - uses: actions/checkout@v4
 
@@ -44,4 +45,10 @@ jobs:
       run: uv run task typecheck
 
     - name: Test
-      run: uv run task test
+      run: uv run task test
+
+  success-python-ci:
+    runs-on: ubuntu-latest
+    needs: python-ci
+    steps:
+      - run: echo "All matrix jobs succeeded!"