## ADDED Requirements

### Requirement: Retrieval evaluation SHALL compare current and sidecar retrieval paths
The retrieval evaluation system SHALL provide an opt-in comparison between the existing retrieval path and the Spring AI sidecar retrieval path.

#### Scenario: Sidecar comparison report
- **WHEN** sidecar comparison is run for the golden case set
- **THEN** the report SHALL include per-case current-path top candidates and sidecar top candidates
- **AND** it SHALL highlight source, breadcrumb, category, rank, and score-label differences

#### Scenario: Offline baseline remains unchanged
- **WHEN** the fixture-based offline baseline evaluator is run
- **THEN** it SHALL not require live Milvus, Spring Boot, or Spring AI sidecar configuration

### Requirement: Retrieval evaluation SHALL make sidecar readiness visible
The sidecar comparison report SHALL show whether the Spring AI sidecar was runnable for the current environment.

#### Scenario: Sidecar unavailable
- **WHEN** sidecar comparison is requested but the sidecar is disabled or unavailable
- **THEN** the report SHALL mark sidecar status as unavailable
- **AND** it SHALL keep current-path baseline results available for review