What

Move benchmarks/BASELINE.md to docs/performance/BASELINE.md in logger_system.

Why

Standardizing BASELINE.md location across all systems.

Related Issues

• Part of docs: Standardize BASELINE.md location across all ecosystem systems #304
• Depends on docs: Create docs/performance/ directories in all systems #307

Actions

1. Move benchmarks/BASELINE.md to docs/performance/BASELINE.md
2. Update benchmarks/README.md to link to new location

Acceptance Criteria

• docs/performance/BASELINE.md exists with content from benchmarks/
• No BASELINE.md in benchmarks/ directory
• benchmarks/README.md links to docs/performance/BASELINE.md