# Link-Not-Merge Advisory Architecture

## Module
Concelier

## Status
IMPLEMENTED

## Description
Advisory confirmed that existing Link-Not-Merge model is architecturally superior to proposed Unified Advisory Schema (UAS). Preserves conflict evidence and 3-component trust vector.

## Implementation Details
- **Modules**: `src/Concelier/__Libraries/StellaOps.Concelier.Core/Linksets/`, `src/Concelier/__Libraries/StellaOps.Concelier.Core/Tenancy/`, `src/Concelier/__Libraries/StellaOps.Concelier.Merge/`
- **Key Classes**:
  - `LinksetCorrelationService` (`src/Concelier/__Libraries/StellaOps.Concelier.Core/Linksets/LinksetCorrelationService.cs`) - correlates advisory linksets preserving source identity
  - `LinksetCorrelationV2` (`src/Concelier/__Libraries/StellaOps.Concelier.Core/Linksets/LinksetCorrelationV2.cs`) - V2 correlation algorithm with improved accuracy
  - `LinksetCorrelation` (`src/Concelier/__Libraries/StellaOps.Concelier.Core/Linksets/LinksetCorrelation.cs`) - V1 correlation logic
  - `LinkNotMergeTenantCapabilitiesProvider` (`src/Concelier/__Libraries/StellaOps.Concelier.Core/Tenancy/TenantCapabilitiesEndpoint.cs`) - tenant capabilities for LNM feature
  - `MergeHashCalculator` (`src/Concelier/__Libraries/StellaOps.Concelier.Merge/Identity/MergeHashCalculator.cs`) - merge hash for linking semantically equivalent advisories
  - `CanonicalAdvisoryService` (`src/Concelier/__Libraries/StellaOps.Concelier.Core/Canonical/CanonicalAdvisoryService.cs`) - canonical advisory with linked source edges
- **Interfaces**: `ILinksetCorrelationService`, `ITenantCapabilitiesProvider`
- **Source**: Feature matrix scan

## E2E Test Plan
- [ ] Ingest two advisories from different sources for the same CVE and verify they are linked (not merged) with separate source identities preserved
- [ ] Verify conflict evidence: ingest conflicting advisories (different CVSS scores for same CVE) and confirm both values are preserved in the linkset
- [ ] Verify 3-component trust vector: query a linked advisory and confirm trust scores from each source are available
- [ ] Verify `LinksetCorrelationService` returns all linked sources for a given canonical advisory
- [ ] Verify tenant capabilities: confirm LNM feature is reported as available via the capabilities endpoint