UI work to fill SBOM sourcing management gap. UI planning remaining functionality exposure. Work on CI/Tests stabilization

Introduces CGS determinism test runs to CI workflows for Windows, macOS, Linux, Alpine, and Debian, fulfilling CGS-008 cross-platform requirements. Updates local-ci scripts to support new smoke steps, test timeouts, progress intervals, and project slicing for improved test isolation and diagnostics.

src/Excititor/__Libraries/StellaOps.Excititor.Core/Observations/VexDeltaModels.cs

@@ -118,6 +118,164 @@ public sealed record VexDeltaRationale
     /// </summary>
     [JsonPropertyName("justificationCode")]
     public string? JustificationCode { get; init; }
+
+    /// <summary>
+    /// Merge trace from VexLens consensus computation (if status change was from consensus).
+    /// Captures how the consensus was reached, including contributing statements and conflicts.
+    /// </summary>
+    [JsonPropertyName("mergeTrace")]
+    public ConsensusMergeTrace? MergeTrace { get; init; }
+}
+
+/// <summary>
+/// Merge trace from VexLens consensus computation.
+/// Records how a consensus status was reached from multiple VEX statements.
+/// </summary>
+public sealed record ConsensusMergeTrace
+{
+    /// <summary>
+    /// Summary of the consensus computation.
+    /// </summary>
+    [JsonPropertyName("summary")]
+    public required string Summary { get; init; }
+
+    /// <summary>
+    /// List of factors that influenced the consensus decision.
+    /// </summary>
+    [JsonPropertyName("factors")]
+    public required IReadOnlyList<string> Factors { get; init; }
+
+    /// <summary>
+    /// Weight assigned to each status by contributing statements.
+    /// </summary>
+    [JsonPropertyName("statusWeights")]
+    public required IReadOnlyDictionary<string, double> StatusWeights { get; init; }
+
+    /// <summary>
+    /// Consensus mode used (HighestWeight, WeightedVote, Lattice, AuthoritativeFirst).
+    /// </summary>
+    [JsonPropertyName("consensusMode")]
+    public required string ConsensusMode { get; init; }
+
+    /// <summary>
+    /// Outcome of the consensus (Unanimous, Majority, Plurality, ConflictResolved, NoData).
+    /// </summary>
+    [JsonPropertyName("outcome")]
+    public required string Outcome { get; init; }
+
+    /// <summary>
+    /// Confidence score (0-1) in the consensus result.
+    /// </summary>
+    [JsonPropertyName("confidenceScore")]
+    public required double ConfidenceScore { get; init; }
+
+    /// <summary>
+    /// Contributions from each VEX statement that participated in consensus.
+    /// </summary>
+    [JsonPropertyName("contributions")]
+    public IReadOnlyList<StatementContributionSnapshot>? Contributions { get; init; }
+
+    /// <summary>
+    /// Conflicts detected during consensus computation.
+    /// </summary>
+    [JsonPropertyName("conflicts")]
+    public IReadOnlyList<ConsensusConflictSnapshot>? Conflicts { get; init; }
+
+    /// <summary>
+    /// When the consensus was computed.
+    /// </summary>
+    [JsonPropertyName("computedAt")]
+    public required DateTimeOffset ComputedAt { get; init; }
+}
+
+/// <summary>
+/// Snapshot of a VEX statement's contribution to consensus.
+/// </summary>
+public sealed record StatementContributionSnapshot
+{
+    /// <summary>
+    /// Statement identifier.
+    /// </summary>
+    [JsonPropertyName("statementId")]
+    public required string StatementId { get; init; }
+
+    /// <summary>
+    /// Issuer identifier.
+    /// </summary>
+    [JsonPropertyName("issuerId")]
+    public string? IssuerId { get; init; }
+
+    /// <summary>
+    /// Issuer name.
+    /// </summary>
+    [JsonPropertyName("issuerName")]
+    public string? IssuerName { get; init; }
+
+    /// <summary>
+    /// Status from this statement.
+    /// </summary>
+    [JsonPropertyName("status")]
+    public required string Status { get; init; }
+
+    /// <summary>
+    /// Weight assigned to this statement.
+    /// </summary>
+    [JsonPropertyName("weight")]
+    public required double Weight { get; init; }
+
+    /// <summary>
+    /// Contribution fraction (weight / total_weight).
+    /// </summary>
+    [JsonPropertyName("contribution")]
+    public required double Contribution { get; init; }
+
+    /// <summary>
+    /// Whether this statement was the winning contributor.
+    /// </summary>
+    [JsonPropertyName("isWinner")]
+    public required bool IsWinner { get; init; }
+}
+
+/// <summary>
+/// Snapshot of a conflict detected during consensus.
+/// </summary>
+public sealed record ConsensusConflictSnapshot
+{
+    /// <summary>
+    /// First conflicting statement ID.
+    /// </summary>
+    [JsonPropertyName("statement1Id")]
+    public required string Statement1Id { get; init; }
+
+    /// <summary>
+    /// Second conflicting statement ID.
+    /// </summary>
+    [JsonPropertyName("statement2Id")]
+    public required string Statement2Id { get; init; }
+
+    /// <summary>
+    /// Status from first statement.
+    /// </summary>
+    [JsonPropertyName("status1")]
+    public required string Status1 { get; init; }
+
+    /// <summary>
+    /// Status from second statement.
+    /// </summary>
+    [JsonPropertyName("status2")]
+    public required string Status2 { get; init; }
+
+    /// <summary>
+    /// Conflict severity (Critical, High, Medium, Low).
+    /// </summary>
+    [JsonPropertyName("severity")]
+    public required string Severity { get; init; }
+
+    /// <summary>
+    /// How the conflict was resolved.
+    /// </summary>
+    [JsonPropertyName("resolution")]
+    public required string Resolution { get; init; }
 }
 
 /// <summary>