Add comprehensive security tests for OWASP A02, A05, A07, and A08 categories

- Implemented tests for Cryptographic Failures (A02) to ensure proper handling of sensitive data, secure algorithms, and key management.
- Added tests for Security Misconfiguration (A05) to validate production configurations, security headers, CORS settings, and feature management.
- Developed tests for Authentication Failures (A07) to enforce strong password policies, rate limiting, session management, and MFA support.
- Created tests for Software and Data Integrity Failures (A08) to verify artifact signatures, SBOM integrity, attestation chains, and feed updates.

docs/benchmarks/fidelity-metrics.md

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+# Fidelity Metrics Framework
+
+> Sprint: SPRINT_3403_0001_0001_fidelity_metrics
+
+This document describes the three-tier fidelity metrics framework for measuring deterministic reproducibility in StellaOps scanner outputs.
+
+## Overview
+
+Fidelity metrics quantify how consistently the scanner produces outputs across replay runs. The framework provides three tiers of measurement, each capturing different aspects of reproducibility:
+
+| Metric | Abbrev. | Description | Target |
+|--------|---------|-------------|--------|
+| Bitwise Fidelity | BF | Byte-for-byte identical outputs | ≥ 0.98 |
+| Semantic Fidelity | SF | Normalized object equivalence | ≥ 0.99 |
+| Policy Fidelity | PF | Policy decision consistency | ≈ 1.0 |
+
+## Metric Definitions
+
+### Bitwise Fidelity (BF)
+
+Measures the proportion of replay runs that produce byte-for-byte identical outputs.
+
+```
+BF = identical_outputs / total_replays
+```
+
+**What it captures:**
+- SHA-256 hash equivalence of all output artifacts
+- Timestamp consistency
+- JSON formatting consistency
+- Field ordering consistency
+
+**When BF < 1.0:**
+- Timestamps embedded in outputs
+- Non-deterministic field ordering
+- Floating-point rounding differences
+- Random identifiers (UUIDs)
+
+### Semantic Fidelity (SF)
+
+Measures the proportion of replay runs that produce semantically equivalent outputs, ignoring formatting differences.
+
+```
+SF = semantic_matches / total_replays
+```
+
+**What it compares:**
+- Package PURLs and versions
+- CVE identifiers
+- Severity levels (normalized to uppercase)
+- VEX verdicts
+- Reason codes
+
+**When SF < 1.0 but BF = SF:**
+- No actual content differences
+- Only formatting differences
+
+**When SF < 1.0:**
+- Different packages detected
+- Different CVEs matched
+- Different severity assignments
+
+### Policy Fidelity (PF)
+
+Measures the proportion of replay runs that produce matching policy decisions.
+
+```
+PF = policy_matches / total_replays
+```
+
+**What it compares:**
+- Final pass/fail decision
+- Reason codes (sorted for comparison)
+- Policy rule triggering
+
+**When PF < 1.0:**
+- Policy outcome differs between runs
+- Indicates a non-determinism bug that affects user-visible decisions
+
+## Prometheus Metrics
+
+The fidelity framework exports the following metrics:
+
+| Metric Name | Type | Labels | Description |
+|-------------|------|--------|-------------|
+| `fidelity_bitwise_ratio` | Gauge | tenant_id, surface_id | Bitwise fidelity ratio |
+| `fidelity_semantic_ratio` | Gauge | tenant_id, surface_id | Semantic fidelity ratio |
+| `fidelity_policy_ratio` | Gauge | tenant_id, surface_id | Policy fidelity ratio |
+| `fidelity_total_replays` | Gauge | tenant_id, surface_id | Number of replays |
+| `fidelity_slo_breach_total` | Counter | breach_type, tenant_id | SLO breach count |
+
+## SLO Thresholds
+
+Default SLO thresholds (configurable):
+
+| Metric | Warning | Critical |
+|--------|---------|----------|
+| Bitwise Fidelity | < 0.98 | < 0.90 |
+| Semantic Fidelity | < 0.99 | < 0.95 |
+| Policy Fidelity | < 1.0 | < 0.99 |
+
+## Integration with DeterminismReport
+
+Fidelity metrics are integrated into the `DeterminismReport` record:
+
+```csharp
+public sealed record DeterminismReport(
+    // ... existing fields ...
+    FidelityMetrics? Fidelity = null);
+
+public sealed record DeterminismImageReport(
+    // ... existing fields ...
+    FidelityMetrics? Fidelity = null);
+```
+
+## Usage Example
+
+```csharp
+// Create fidelity metrics service
+var service = new FidelityMetricsService(
+    new BitwiseFidelityCalculator(),
+    new SemanticFidelityCalculator(),
+    new PolicyFidelityCalculator());
+
+// Compute fidelity from baseline and replays
+var baseline = LoadScanResult("scan-baseline.json");
+var replays = LoadReplayScanResults();
+var fidelity = service.Compute(baseline, replays);
+
+// Check thresholds
+if (fidelity.BitwiseFidelity < 0.98)
+{
+    logger.LogWarning("BF below threshold: {BF}", fidelity.BitwiseFidelity);
+}
+
+// Include in determinism report
+var report = new DeterminismReport(
+    // ... other fields ...
+    Fidelity: fidelity);
+```
+
+## Mismatch Diagnostics
+
+When fidelity is below threshold, the framework provides diagnostic information:
+
+```csharp
+public sealed record FidelityMismatch
+{
+    public required int RunIndex { get; init; }
+    public required FidelityMismatchType Type { get; init; }
+    public required string Description { get; init; }
+    public IReadOnlyList<string>? AffectedArtifacts { get; init; }
+}
+
+public enum FidelityMismatchType
+{
+    BitwiseOnly,    // Hash differs but content equivalent
+    SemanticOnly,   // Content differs but policy matches
+    PolicyDrift     // Policy decision differs
+}
+```
+
+## Configuration
+
+Configure fidelity options via `FidelityThresholds`:
+
+```json
+{
+  "Fidelity": {
+    "BitwiseThreshold": 0.98,
+    "SemanticThreshold": 0.99,
+    "PolicyThreshold": 1.0,
+    "EnableDiagnostics": true,
+    "MaxMismatchesRecorded": 100
+  }
+}
+```
+
+## Related Documentation
+
+- [Determinism and Reproducibility Technical Reference](../product-advisories/14-Dec-2025%20-%20Determinism%20and%20Reproducibility%20Technical%20Reference.md)
+- [Determinism Scoring Foundations Sprint](../implplan/SPRINT_3401_0001_0001_determinism_scoring_foundations.md)
+- [Scanner Architecture](../modules/scanner/architecture.md)
+
+## Source Files
+
+- `src/Scanner/StellaOps.Scanner.Worker/Determinism/FidelityMetrics.cs`
+- `src/Scanner/StellaOps.Scanner.Worker/Determinism/FidelityMetricsService.cs`
+- `src/Scanner/StellaOps.Scanner.Worker/Determinism/Calculators/`
+- `src/Telemetry/StellaOps.Telemetry.Core/FidelityMetricsTelemetry.cs`
+- `src/Telemetry/StellaOps.Telemetry.Core/FidelitySloAlertingService.cs`