Fix: Add shell: bash for Windows compatibility

The Verify source code step uses Bash syntax (if/then/else)
which doesn't work with PowerShell on Windows runners.
Adding shell: bash ensures Bash is used on all platforms.

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

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

Author: SentienceDEV

.github/workflows/test.yml

@@ -35,6 +35,7 @@ jobs:
         pip install pre-commit mypy types-requests
 
     - name: Verify source code
+      shell: bash
       run: |
         echo "=== Checking agent_runtime.py line 345 ==="
         sed -n '340,350p' sentience/agent_runtime.py