fix(ci): Simplify CI to only test pure Python code

Tests mock the MCP and PyGObject dependencies, so we don't need
to install the full system dependencies in CI. This avoids the
girepository-2.0 version conflicts.

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

Author: anbeckham

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-22.04  # Use 22.04 for better PyGObject compatibility
+    runs-on: ubuntu-latest
     strategy:
       matrix:
         python-version: ['3.10', '3.11', '3.12']
@@ -21,24 +21,10 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
 
-      - name: Install system dependencies
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y \
-            python3-gi \
-            python3-pyatspi \
-            gir1.2-atspi-2.0 \
-            gir1.2-gtk-3.0 \
-            at-spi2-core \
-            libgirepository1.0-dev \
-            libcairo2-dev \
-            pkg-config \
-            python3-dev
-
-      - name: Install Python dependencies
+      - name: Install test dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install pytest pytest-asyncio mcp pycairo PyGObject
+          pip install pytest pytest-asyncio
 
       - name: Run tests
         run: |