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>

PROGRESS.md

@@ -54,7 +54,9 @@
 
 ## In progress
 
-_(없음)_
+| 날짜 | 항목 | 담당 |
+|------|------|------|
+| 2026-04-09 | P1-4+5: Runner sidecar 라이브 검증 + normalizer engine-state 프로파일 | Claude Sonnet 4.6 |
 
 ## Follow-ups