chore: run the Python suite from the repository root

The workflow sat at `recognization/.github/workflows/`, but Actions only reads
`.github/workflows` at the repository root, so it never ran. Moved unchanged;
it already sets `working-directory: recognization`.

Verified locally with the same command the workflow runs:
`python -m unittest discover -s code -p 'test_*.py'` - 255 tests, OK, 2
real-model skips.

.github/workflows/test.yml

@@ -0,0 +1,24 @@
+name: tests
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  model-free:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: recognization
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - name: Install pinned dependencies
+        run: python -m pip install -r requirements.lock
+      - name: Model-free suite
+        env:
+          YOLO_OFFLINE: "1"
+          YOLO_AUTOINSTALL: "false"
+        run: python -m unittest discover -s code -p 'test_*.py' -v