fix: add PR write permissions for coverage, add Python 3.14 to CI

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: brtkwr

.github/workflows/test.yml

@@ -6,12 +6,16 @@ on:
   pull_request:
     branches: [ main ]
 
+permissions:
+  contents: read
+  pull-requests: write
+
 jobs:
   test:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.11', '3.12', '3.13']
+        python-version: ['3.11', '3.12', '3.13', '3.14']
 
     steps:
     - name: 📥 Checkout code
@@ -21,6 +25,7 @@ jobs:
       uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
+        allow-prereleases: true
 
     - name: 📦 Install uv
       uses: astral-sh/setup-uv@v4