What

Create docs/performance/ directory structure in all ecosystem systems where it doesn't exist.

Why

Part of standardization effort to have consistent BASELINE.md location.
Prerequisite for moving BASELINE.md files to the standard location.

Related Issues

• Part of docs: Standardize BASELINE.md location across all ecosystem systems #304

Affected Systems

• thread_system (if missing)
• logger_system (if missing)
• container_system (if missing)
• monitoring_system (already exists)
• database_system (already exists)
• network_system (if missing)

Acceptance Criteria

• docs/performance/ exists in all systems
• Directory permissions are correct
• .gitkeep file added if directory would be empty