feat: Add initial implementation of Vulnerability Resolver Jobs

- Created project for StellaOps.Scanner.Analyzers.Native.Tests with necessary dependencies.
- Documented roles and guidelines in AGENTS.md for Scheduler module.
- Implemented IResolverJobService interface and InMemoryResolverJobService for handling resolver jobs.
- Added ResolverBacklogNotifier and ResolverBacklogService for monitoring job metrics.
- Developed API endpoints for managing resolver jobs and retrieving metrics.
- Defined models for resolver job requests and responses.
- Integrated dependency injection for resolver job services.
- Implemented ImpactIndexSnapshot for persisting impact index data.
- Introduced SignalsScoringOptions for configurable scoring weights in reachability scoring.
- Added unit tests for ReachabilityScoringService and RuntimeFactsIngestionService.
- Created dotnet-filter.sh script to handle command-line arguments for dotnet.
- Established nuget-prime project for managing package downloads.

src/Findings/StellaOps.Findings.Ledger/Observability/LedgerTimeline.cs

@@ -0,0 +1,65 @@
+using System.Diagnostics;
+using Microsoft.Extensions.Logging;
+using StellaOps.Findings.Ledger.Domain;
+
+namespace StellaOps.Findings.Ledger.Observability;
+
+/// <summary>
+/// Emits structured timeline events for ledger operations.
+/// Currently materialised as structured logs; can be swapped for event sink later.
+/// </summary>
+internal static class LedgerTimeline
+{
+    private static readonly EventId LedgerAppended = new(6101, "ledger.event.appended");
+    private static readonly EventId ProjectionUpdated = new(6201, "ledger.projection.updated");
+
+    public static void EmitLedgerAppended(ILogger logger, LedgerEventRecord record, string? evidenceBundleRef = null)
+    {
+        if (logger is null)
+        {
+            return;
+        }
+
+        var traceId = Activity.Current?.TraceId.ToHexString() ?? string.Empty;
+
+        logger.LogInformation(
+            LedgerAppended,
+            "timeline ledger.event.appended tenant={Tenant} chain={ChainId} seq={Sequence} event={EventId} type={EventType} policy={PolicyVersion} finding={FindingId} trace={TraceId} evidence_ref={EvidenceRef}",
+            record.TenantId,
+            record.ChainId,
+            record.SequenceNumber,
+            record.EventId,
+            record.EventType,
+            record.PolicyVersion,
+            record.FindingId,
+            traceId,
+            evidenceBundleRef ?? record.EvidenceBundleReference ?? string.Empty);
+    }
+
+    public static void EmitProjectionUpdated(
+        ILogger logger,
+        LedgerEventRecord record,
+        string? evaluationStatus,
+        string? evidenceBundleRef = null)
+    {
+        if (logger is null)
+        {
+            return;
+        }
+
+        var traceId = Activity.Current?.TraceId.ToHexString() ?? string.Empty;
+
+        logger.LogInformation(
+            ProjectionUpdated,
+            "timeline ledger.projection.updated tenant={Tenant} chain={ChainId} seq={Sequence} event={EventId} policy={PolicyVersion} finding={FindingId} status={Status} trace={TraceId} evidence_ref={EvidenceRef}",
+            record.TenantId,
+            record.ChainId,
+            record.SequenceNumber,
+            record.EventId,
+            record.PolicyVersion,
+            record.FindingId,
+            evaluationStatus ?? string.Empty,
+            traceId,
+            evidenceBundleRef ?? record.EvidenceBundleReference ?? string.Empty);
+    }
+}