Add Canonical JSON serialization library with tests and documentation

- Implemented CanonJson class for deterministic JSON serialization and hashing.
- Added unit tests for CanonJson functionality, covering various scenarios including key sorting, handling of nested objects, arrays, and special characters.
- Created project files for the Canonical JSON library and its tests, including necessary package references.
- Added README.md for library usage and API reference.
- Introduced RabbitMqIntegrationFactAttribute for conditional RabbitMQ integration tests.

bench/determinism/run-replay.sh

@@ -0,0 +1,133 @@
+#!/usr/bin/env bash
+# run-replay.sh
+# Deterministic Replay Benchmark
+# Sprint: SPRINT_3850_0001_0001
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+RESULTS_DIR="$SCRIPT_DIR/results/$(date -u +%Y%m%d_%H%M%S)"
+
+# Parse arguments
+MANIFEST_FILE=""
+RUNS=5
+VERBOSE=false
+
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        --manifest)
+            MANIFEST_FILE="$2"
+            shift 2
+            ;;
+        --runs)
+            RUNS="$2"
+            shift 2
+            ;;
+        --verbose|-v)
+            VERBOSE=true
+            shift
+            ;;
+        *)
+            echo "Unknown option: $1"
+            exit 1
+            ;;
+    esac
+done
+
+echo "╔════════════════════════════════════════════════╗"
+echo "║       Deterministic Replay Benchmark           ║"
+echo "╚════════════════════════════════════════════════╝"
+echo ""
+echo "Configuration:"
+echo "  Manifest:    ${MANIFEST_FILE:-<default sample>}"
+echo "  Runs:        $RUNS"
+echo "  Results dir: $RESULTS_DIR"
+echo ""
+
+mkdir -p "$RESULTS_DIR"
+
+# Use sample manifest if none provided
+if [ -z "$MANIFEST_FILE" ] && [ -f "$SCRIPT_DIR/fixtures/sample-manifest.json" ]; then
+    MANIFEST_FILE="$SCRIPT_DIR/fixtures/sample-manifest.json"
+fi
+
+declare -a HASHES
+
+echo "Running $RUNS iterations..."
+echo ""
+
+for i in $(seq 1 $RUNS); do
+    echo -n "  Run $i: "
+    
+    OUTPUT_FILE="$RESULTS_DIR/run_$i.json"
+    
+    if command -v dotnet &> /dev/null; then
+        # Run the replay service
+        dotnet run --project "$SCRIPT_DIR/../../src/Scanner/StellaOps.Scanner.WebService" -- \
+            replay \
+            --manifest "$MANIFEST_FILE" \
+            --output "$OUTPUT_FILE" \
+            --format json 2>/dev/null || {
+                echo "⊘ Skipped (replay command not available)"
+                continue
+            }
+        
+        if [ -f "$OUTPUT_FILE" ]; then
+            HASH=$(sha256sum "$OUTPUT_FILE" | cut -d' ' -f1)
+            HASHES+=("$HASH")
+            echo "sha256:${HASH:0:16}..."
+        else
+            echo "⊘ No output generated"
+        fi
+    else
+        echo "⊘ Skipped (dotnet not available)"
+    fi
+done
+
+echo ""
+
+# Verify all hashes match
+if [ ${#HASHES[@]} -gt 1 ]; then
+    FIRST_HASH="${HASHES[0]}"
+    ALL_MATCH=true
+    
+    for hash in "${HASHES[@]}"; do
+        if [ "$hash" != "$FIRST_HASH" ]; then
+            ALL_MATCH=false
+            break
+        fi
+    done
+    
+    echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+    echo "Results"
+    echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+    
+    if $ALL_MATCH; then
+        echo "✓ PASS: All $RUNS runs produced identical output"
+        echo "  Hash: sha256:$FIRST_HASH"
+    else
+        echo "✗ FAIL: Outputs differ between runs"
+        echo ""
+        echo "Hashes:"
+        for i in "${!HASHES[@]}"; do
+            echo "  Run $((i+1)): ${HASHES[$i]}"
+        done
+    fi
+else
+    echo "ℹ️  Insufficient runs to verify determinism"
+fi
+
+# Create summary JSON
+cat > "$RESULTS_DIR/summary.json" <<EOF
+{
+  "benchmark": "determinism-replay",
+  "timestamp": "$(date -u +%Y-%m-%dT%H:%M:%SZ)",
+  "manifest": "$MANIFEST_FILE",
+  "runs": $RUNS,
+  "hashes": [$(printf '"%s",' "${HASHES[@]}" | sed 's/,$//')],
+  "deterministic": ${ALL_MATCH:-null}
+}
+EOF
+
+echo ""
+echo "Results saved to: $RESULTS_DIR"