feat: engine-state normalizer profile + sort_array_elements rule (#10)

- Rules.SortArrayElements: sort JSON arrays lexicographically (post-mask_guids order-independence)
- Normalizer output: UnsafeRelaxedJsonEscaping to preserve <GUID>/<TS>/<VOLATILE> tokens
- profiles/engine-state.yaml: normalize_paths + mask_guids + sort_array_elements + round_floats(2dp) + sort_json_keys
- RunnerOptions.SidecarProfile: default "engine-state", overridable via --sidecar-profile
- TestRunner.CaptureAndDiffSidecar: uses SidecarProfile instead of main Profile
- 4 new normalizer tests (136 total)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/Recordingtest.Runner/Program.cs

@@ -18,11 +18,13 @@ public static class Program
                 case "--no-launch": options.NoLaunch = true; break;
                 case "--sidecar-url": sidecarUrl = args[++i]; break;
                 case "--no-sidecar": noSidecar = true; break;
+                case "--sidecar-profile": options.SidecarProfile = args[++i]; break;
                 case "-h":
                 case "--help":
                     Console.WriteLine("Usage: Recordingtest.Runner --scenarios <dir> --baselines <dir> --out <dir>");
                     Console.WriteLine("                           [--profile <name>] [--no-launch]");
                     Console.WriteLine("                           [--sidecar-url http://localhost:38080] [--no-sidecar]");
+                    Console.WriteLine("                           [--sidecar-profile engine-state]");
                     return 0;
             }
         }