# Verification Report

**Change**: cerebro-single-node-vs-remote-ha-storage-strategy-700
**Version**: N/A

---

### Completeness

| Metric | Value |
|--------|-------|
| Tasks total | 11 |
| Tasks complete | 11 |
| Tasks incomplete | 0 |

Assessment: the task ledger is complete and matches the implementation evidence for this change.

---

### Build & Tests Execution

Configured and targeted verification commands executed for the current state:
- `cargo fmt --all -- --check` ✅ Passed
- `cargo test` ✅ Passed
- `pnpm --dir clients/web/apps/docs astro check` ✅ Passed
- `rg -n "single-node and local-first|node-local durable alternative|unsupported in this build|test-only operational scaffolding|backup, restore, or node replacement|remote_surreal" ...` ✅ Passed as wording audit evidence

```text
cargo fmt --all -- --check
exit code: 0

cargo test
exit code: 0
39 Rust tests passed, 0 failed, 0 ignored, 0 measured
including:
- validation_rejects_remote_surreal_mode
- validation_rejects_remote_surreal_fallback
- explicit_storage_override_bypasses_embedded_default
- fallback_policy_is_used_on_primary_init_failure
- fallback_reports_active_mode
- no_fallback_configured_fails_fast

pnpm --dir clients/web/apps/docs astro check
exit code: 0
Result (3 files):
- 0 errors
- 0 warnings
- 0 hints

rg wording audit
exit code: 0
Confirmed presence of required support-boundary phrases across:
- openspec/specs/gateway/spec.md
- openspec/specs/cerebro/spec.md
- clients/web/apps/docs/src/content/docs/cerebro/configuration.md
- clients/web/apps/docs/src/content/docs/cerebro/operations.md
- .github/workflows/_build-cerebro-binaries.yml
```

**Tests**: ✅ 39 passed / ❌ 0 failed / ⚠️ 0 skipped

---

### Spec Compliance Matrix

| Requirement | Scenario | Evidence | Result |
|-------------|----------|----------|--------|
| Gateway: Cerebro Supported Durable Production Topology | Single-node durable production is the only supported topology | `openspec/specs/gateway/spec.md` wording audit | ✅ COMPLIANT |
| Gateway: Cerebro Supported Durable Production Topology | Local durable alternative remains bounded to one node | `openspec/specs/gateway/spec.md` wording audit | ✅ COMPLIANT |
| Gateway: Unsupported Remote and HA Persistence Claims | Remote shared storage is described as unsupported | `openspec/specs/gateway/spec.md`; docs wording audit | ✅ COMPLIANT |
| Gateway: Unsupported Remote and HA Persistence Claims | HA claim is rejected without follow-on specification | `openspec/specs/gateway/spec.md` wording audit | ✅ COMPLIANT |
| Gateway: Operational Guidance for Single-Node Local-First Durability | Operator guidance separates production posture from backup strategy | `openspec/specs/gateway/spec.md`; `clients/web/apps/docs/src/content/docs/cerebro/operations.md` wording audit | ✅ COMPLIANT |
| Gateway: Operational Guidance for Single-Node Local-First Durability | CI-safe storage mode does not redefine production support | `openspec/specs/gateway/spec.md`; `.github/workflows/_build-cerebro-binaries.yml` wording audit | ✅ COMPLIANT |
| Cerebro: Embedded SurrealDB Default Storage Mode | Default storage mode uses embedded SurrealDB for single-node durability | `clients/cerebro/tests/storage_config_test.rs > default_storage_mode_is_embedded`; `clients/cerebro/tests/embedded_storage_test.rs > embedded_storage_supports_crud` | ✅ COMPLIANT |
| Cerebro: Embedded SurrealDB Default Storage Mode | Explicit override remains limited to supported local modes | `clients/cerebro/tests/storage_config_test.rs > explicit_storage_override_bypasses_embedded_default` | ✅ COMPLIANT |
| Cerebro: Embedded SurrealDB Default Storage Mode | Remote storage mode is not a supported override | `clients/cerebro/tests/storage_config_test.rs > validation_rejects_remote_surreal_mode` | ✅ COMPLIANT |
| Cerebro: Operational Fallback When Embedded SurrealDB Is Unavailable | Supported local fallback is used | `clients/cerebro/tests/storage_config_test.rs > fallback_policy_is_used_on_primary_init_failure`; `fallback_reports_active_mode` | ✅ COMPLIANT |
| Cerebro: Operational Fallback When Embedded SurrealDB Is Unavailable | Unsupported remote fallback is rejected | `clients/cerebro/tests/storage_config_test.rs > validation_rejects_remote_surreal_fallback` | ✅ COMPLIANT |
| Cerebro: Operational Fallback When Embedded SurrealDB Is Unavailable | No supported fallback configured | `clients/cerebro/tests/storage_config_test.rs > no_fallback_configured_fails_fast` | ✅ COMPLIANT |
| Cerebro: Unsupported Remote Shared Persistence Boundary | Supported storage modes remain local-first | `openspec/specs/cerebro/spec.md`; docs wording audit; config validation tests | ✅ COMPLIANT |
| Cerebro: Unsupported Remote Shared Persistence Boundary | Multi-node persistence is not claimed by storage behavior spec | `openspec/specs/cerebro/spec.md`; docs wording audit | ✅ COMPLIANT |

**Compliance summary**: 14/14 scenarios compliant

Note: gateway scenarios are normative documentation/operational-contract scenarios, so compliance is established by explicit source-of-truth wording plus aligned downstream artifacts rather than executable runtime tests.

---

### Correctness

| Requirement | Status | Notes |
|------------|--------|-------|
| Gateway: Cerebro Supported Durable Production Topology | ✅ Implemented | Main source-of-truth explicitly states single-node/local-first durable production, embedded default, and disk as node-local alternative. |
| Gateway: Unsupported Remote and HA Persistence Claims | ✅ Implemented | Gateway and docs explicitly state remote/shared SurrealDB and HA persistence are unsupported in this build. |
| Gateway: Operational Guidance for Single-Node Local-First Durability | ✅ Implemented | Gateway, docs, and workflow wording distinguish production posture from CI/test scaffolding. |
| Cerebro: Embedded SurrealDB Default Storage Mode | ✅ Implemented | Runtime defaults to embedded mode and tests cover default, override, and remote rejection behavior. |
| Cerebro: Operational Fallback When Embedded SurrealDB Is Unavailable | ✅ Implemented | Runtime supports local fallback, fails fast without fallback, and now has a direct test rejecting remote fallback. |
| Cerebro: Unsupported Remote Shared Persistence Boundary | ✅ Implemented | Runtime rejects remote mode/fallback and source-of-truth/docs consistently describe remote/shared/HA as unsupported. |

---

### Coherence (Design)

| Decision | Followed? | Notes |
|----------|-----------|-------|
| `gateway` is the primary source-of-truth for operational support posture | ✅ Yes | Main spec changes live in `openspec/specs/gateway/spec.md`. |
| `cerebro` remains supporting owner for storage-mode semantics | ✅ Yes | `openspec/specs/cerebro/spec.md` stays focused on storage modes, fallback, and remote rejection. |
| Change updates specification truth, not implementation reality | ✅ Yes | Product behavior was not widened; only one focused regression-style test was added to cover an existing rejection rule. |
| Unsupported remote/HA capability is expressed as explicit negative contract | ✅ Yes | Touched specs/docs/workflow consistently use “unsupported in this build”. |
| Terminology distinguishes support class from test posture | ✅ Yes | `in_memory` smoke usage is clearly labeled test-only scaffolding. |
| File changes match the design file table | ✅ Yes | The design file table was updated to match the actual touched artifacts. |

---

### Issues Found

**CRITICAL**
- None.

**WARNING**
- This verification pass used targeted docs checks (`astro check`) plus a wording audit rather than the full monorepo web validation suite. That is appropriate for the touched docs/workflow scope, but broader regressions outside this change were not re-run here.

**SUGGESTION**
- If future changes continue to add operational-contract scenarios in `gateway`, consider adding a small scripted spec/docs compliance check so wording-based scenarios remain machine-auditable.

---

### Verdict
PASS

The change is complete, coherent, and correctly implemented for its bounded scope. Runtime validation rejects unsupported remote mode and remote fallback, the source-of-truth now clearly states the single-node/local-first production boundary, downstream docs and workflow wording are aligned, and all scenarios in the approved spec set have matching evidence.
