revert(ci): restore original Test Suite workflow

The optimized workflow in c01f8599 set astral-sh/setup-uv@v4 with
cache-dependency-glob: "uv.lock", but uv.lock is gitignored in this
repo, so the hosted runner's checkout never contains it and the
Install uv step fails with:

  Error: No file matched to [uv.lock], make sure you have
  checked out the target repository

Reverting the workflow to the pre-c01f8599 version to unbreak CI.

The "Modifying CI Workflows" section added to CONTRIBUTING.md in the
same commit is left in place; it documents general guidance and is
independent of this specific implementation choice.

Co-authored-by: Cursor <cursoragent@cursor.com>

.github/workflows/ci.yml

@@ -2,53 +2,17 @@ name: Test Suite
 
 on:
   push:
-    branches: [main, nightly]
+    branches: [ main, nightly ]
   pull_request:
-    branches: [main, nightly]
+    branches: [ main, nightly ]
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
-
-permissions:
-  contents: read
 
 jobs:
-  lint:
-    runs-on: ubuntu-latest
-    timeout-minutes: 5
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Set up Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: "3.14"
-
-      - name: Install uv
-        uses: astral-sh/setup-uv@v4
-        with:
-          enable-cache: true
-          cache-dependency-glob: "uv.lock"
-
-      - name: Install system dependencies
-        run: sudo apt-get update && sudo apt-get install -y libolm-dev build-essential
-
-      - name: Install dependencies
-        run: uv sync --all-extras
-
-      - name: Lint with ruff
-        run: uv run ruff check nanobot --select F
-
   test:
-    needs: lint
     runs-on: ${{ matrix.os }}
-    timeout-minutes: 20
     strategy:
-      fail-fast: false
       matrix:
-        os: ${{ github.event_name == 'pull_request' && fromJSON('["ubuntu-latest"]') || fromJSON('["ubuntu-latest","windows-latest"]') }}
+        os: [ubuntu-latest, windows-latest]
-        python-version: ${{ github.event_name == 'pull_request' && fromJSON('["3.11","3.14"]') || fromJSON('["3.11","3.12","3.13","3.14"]') }}
+        python-version: ["3.11", "3.12", "3.13", "3.14"]
 
     steps:
     - uses: actions/checkout@v4
@@ -60,9 +24,6 @@ jobs:
 
     - name: Install uv
       uses: astral-sh/setup-uv@v4
-        with:
-          enable-cache: true
-          cache-dependency-glob: "uv.lock"
 
     - name: Install system dependencies (Linux)
       if: runner.os == 'Linux'
@@ -71,5 +32,8 @@ jobs:
     - name: Install dependencies
       run: uv sync --all-extras
 
+    - name: Lint with ruff
+      run: uv run ruff check nanobot --select F
+
     - name: Run tests
       run: uv run pytest tests/