Simplify test matrix to match simulation repo

- Python 3.13 / Django 5.2 / SQLite (fast feedback)
- Python 3.13 / Django 5.2 / MariaDB (production)
- Python 3.14 / Django 6.0 / MariaDB (experimental)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: rh0dium

.github/workflows/main.yml

@@ -120,16 +120,27 @@ jobs:
           path: report.json
 
   tests:
+    name: Python ${{ matrix.python-version }} / ${{ matrix.db }} / Django ${{ matrix.django-version }}${{ matrix.experimental && ' (experimental)' || '' }}
     if: ${{ !startsWith(github.ref, 'refs/heads/gh-readonly-queue/') }}
-    name: Python ${{ matrix.python-version }} / ${{ matrix.db }} / Django ${{ matrix.django-version}}
     runs-on: ubuntu-latest
-#    continue-on-error: ${{ matrix.django-version == '~=5.0' }}
+    continue-on-error: ${{ matrix.experimental || false }}
     strategy:
-      max-parallel: 4
+      max-parallel: 3
       matrix:
-        db: [ sqlite, mariadb ]
-        django-version: [ "~=5.0" ]
-        python-version: ["3.12", "3.13" ]
+        include:
+          # Fast feedback with SQLite
+          - python-version: "3.13"
+            django-version: "~=5.2"
+            db: sqlite
+          # Production configuration
+          - python-version: "3.13"
+            django-version: "~=5.2"
+            db: mariadb
+          # Future-proofing (experimental - allowed to fail)
+          - python-version: "3.14"
+            django-version: "~=6.0"
+            db: mariadb
+            experimental: true
 
     services:
       mariadb: