Establishes shared infrastructure for content services: - Common dependencies (DocumentRepository, AuditService, UserIdKeyResolver) - Audit helper methods (sync and async) - Inherits from RepositoryService for scope/query support - Adds ContentServiceConstants for shared constants (batch page size) Updated tracking test to look for correct assembly location. Tracking test now fails (expected) - signals class exists for future work. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>