## ADDED Requirements

### Requirement: Verifier inputs SHALL tolerate hardened no-evidence semantics
The verifier integration SHALL continue to work when evidence summaries distinguish failed calls, no-hit calls, and deduped retrievals more explicitly.

#### Scenario: Failed evidence remains a verifier-visible gap
- **WHEN** an evidence-bearing tool invocation fails
- **THEN** the verifier-facing trace summary SHALL preserve that failure as a gap
- **AND** the verifier flow SHALL continue without crashing

#### Scenario: Deduped retrievals do not count as fresh support
- **WHEN** the verifier-facing trace summary contains deduped `lookup_knowledge` entries
- **THEN** those entries SHALL be treated as no-new-evidence
- **AND** they SHALL NOT be interpreted as fresh direct support for the answer