Adds unit test file for ContentServiceBase with documented test cases. Tests are commented out until ContentServiceBase is created in Phase 1: - 2 audit helper method tests - 2 scope provider access pattern tests - 2 logger injection tests - 1 repository access test 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>