# STORY-020 — reviewer — 20260505T104902

## Resultado
✅ Éxito


### Intento 1 (exit code: 0)

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### stdout (intento 1)

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---

## ✅ STORY-020 → **Business Review**

### Resumen de la revisión

| Verificación | Resultado |
|---|---|
| `cargo check` | ✅ Limpio |
| `cargo test` | ✅ **422 tests** (421 passed, 0 failed, 1 ignorado) |
| `tests/architecture.rs` | ✅ **11/11** |
| `cargo fmt --check` | ✅ Sin cambios |
| `cargo clippy -- -D warnings` | ✅ 0 warnings |

### CAs cubiertos por 21 tests (`story020` module)

| CA | Tests |
|---|---|
| CA1 — `TokenCount` struct | `token_count_exists_with_correct_fields`, `token_count_zero_values` |
| CA2 — `Debug, Clone, Default` | `token_count_implements_debug`, `token_count_implements_clone`, `token_count_implements_default`, `token_count_default_is_zero` |
| CA3 — campo `token_usage` | `shared_state_has_token_usage_field`, `token_usage_default_is_empty` |
| CA4 — `new()` inicializa | `shared_state_new_initializes_token_usage`, `shared_state_new_isolates_token_usage`, `token_usage_writable_after_new` |
| CA5 — `Clone` comparte Arc | `shared_state_implements_clone`, `clone_shares_existing_fields` |
| CA8 — lectura/escritura concurrente | `token_usage_write_then_read`, `token_usage_multiple_readers`, `token_usage_write_lock_is_exclusive`, `token_usage_append_to_existing_story`, `token_usage_multiple_stories` |
| CA9 — clone comparte `token_usage` | `clone_shares_token_usage_write_visible`, `clone_append_visible_in_original`, `multiple_clones_share_same_token_usage` |

### Decision document
→ `.regista/decisions/STORY-020-reviewer-dod-2026-05-05.md`

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