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CHANGELOG.md

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+# Changelog
+
+All notable changes to VaultMesh are documented in this file.
+
+## [Unreleased] - 2025-12-07
+
+### Added
+
+#### Observability Engine
+- Prometheus exporter at `:9108/metrics` with 4 metrics:
+  - `vaultmesh_receipts_total` (counter by module)
+  - `vaultmesh_receipts_failed_total` (counter by module, reason)
+  - `vaultmesh_anchor_age_seconds` (gauge)
+  - `vaultmesh_emit_seconds` (histogram by module)
+- Docker Compose stack (Prometheus + Grafana + Exporter)
+- Grafana dashboard JSON at `docs/observability/dashboards/receipts.json`
+- 8 unit + integration tests for observability
+
+#### Guardian Engine
+- Full implementation replacing stub (~200 LoC)
+- `compute_scroll_root()` and `anchor()` methods
+- Optional `metrics` feature for observability integration
+- `set_anchor_age(0.0)` after each anchor (fresh anchor indicator)
+- Metrics integration test (`--features metrics`)
+- 5 unit tests
+
+#### Treasury Engine
+- Full implementation replacing stub (~300 LoC)
+- Budget management: `create_budget`, `debit`, `credit`
+- Receipt emission for all financial operations
+- Optional `metrics` feature for observability integration
+- 5 unit tests
+
+#### Mesh Engine
+- Full implementation replacing stub (~400 LoC)
+- Node management: `node_join`, `node_leave`
+- Route management: `route_add`, `route_remove`
+- Capability management: `capability_grant`, `capability_revoke`
+- Topology snapshots with `topology_snapshot()`
+- 6 receipt types: `mesh_node_join`, `mesh_node_leave`, `mesh_route_change`, `mesh_capability_grant`, `mesh_capability_revoke`, `mesh_topology_snapshot`
+- Optional `metrics` feature for observability integration
+- Metrics integration test (`--features metrics`)
+- 5 unit tests + 1 integration test
+
+#### Core
+- 13 unit tests for hash.rs and did.rs
+
+#### MCP Server
+- 7 Claude tools in `packages/vaultmesh_mcp/`:
+  - `guardian_anchor_now`
+  - `guardian_verify_receipt`
+  - `guardian_status`
+  - `treasury_create_budget`
+  - `treasury_balance`
+  - `treasury_debit`
+  - `treasury_credit`
+- Receipt emission for all tool calls
+
+#### CI/CD
+- GitLab CI pipeline with build/test/lint stages
+- `observability-smoke` job for exporter tests
+- `guardian-metrics-integration` job for guardian metrics integration test
+- `mesh-metrics-integration` job for mesh metrics integration test
+- `before_script` to ensure receipts directories exist (including `receipts/mesh`)
+
+### Notes
+- Total tests in workspace: 40 (38 workspace + 2 metrics integration)
+- Level-of-Done score: 2.5 → 4.0