## MODIFIED Requirements

### Requirement: Verifier SHALL be observable
The Verifier's verdict SHALL be persisted for observability.

#### Scenario: prompt audit written to verifier evaluation
- **WHEN** the Chat verifier evaluation is persisted
- **THEN** the system SHALL include a `prompt_audit` object under `diagnosis_session.self_evaluation.verifier_evaluation`
- **AND** `prompt_audit.version` SHALL identify the Chat prompt audit catalog version
- **AND** `prompt_audit.prompts` SHALL include the planner, executor, verifier, and composer prompt names and versions
- **AND** full prompt text SHALL NOT be persisted in `prompt_audit`

#### Scenario: prompt audit available on fallback paths
- **WHEN** Chat verifier parsing fails, Composer parsing fails, or Chat produces a degraded answer
- **THEN** the persisted verifier evaluation SHALL still include `prompt_audit`