Fix smoke 1차 follow-up gaps: player resolver, type target, filter, utf8 (#12)

docs/history/2026-04-07_이슈12-smoke2-fix-generator.md

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+# 2026-04-07 이슈 #12 Smoke 2회차 fix — Generator
+
+- **이슈**: #12
+- **롤**: Generator (Planner/Generator/Evaluator 사이클)
+- **소요 시간**: ~50분
+- **Context 사용량**: ~75k tokens
+
+## 작업 요약
+
+Smoke 1회차에서 발견된 4개 구조적 gap을 unit test 가능한 형태로 수정.
+
+| Gap | 위치 | 수정 |
+|-----|------|------|
+| A | Player full-path resolver | `UiaPathParser` + `IUiaTreeNode`/`UiaPathResolver` 신규. `UiaPlayerHost.ResolveElement`가 FlaUI tree adapter로 segment chain descend |
+| B | Recorder type step target inheritance | `DragCollapser`에 `lastFocusPath`/`lastMousePath` 추적, `FlushType()`이 typeRes 없을 때 fallback |
+| C | SUT 외 창 필터 | `IWindowFilter` + `SutProcessWindowFilter` 도입, `LowLevelHook.Filter`가 mouse/key 모두 필터링. `Program.cs`에서 `WindowFromPoint`/`GetForegroundWindow` 와이어업 |
+| D | UTF-8 BOM 없는 yaml 명시 | `ScenarioWriter.WriteToFile`이 `new UTF8Encoding(false)`로 저장 |
+
+## 새 테스트 (10건)
+
+Player.Tests:
+- `UiaPathParser_ParsesMultiSegment_WithClassAndId`
+- `UiaPathParser_ParsesNameAttribute`
+- `UiaPathResolver_Descend_FindsNestedElement`
+- `UiaPathResolver_LastSegmentWithoutId_UsesClassName`
+- `UiaPathResolver_NotFound_ReturnsNull`
+- `SmokeRegression_BoxV4CleanLike_ParsesAndResolves`
+
+Recorder.Tests:
+- `DragCollapser_TypeAfterFocusChange_InheritsTarget`
+- `DragCollapser_TypeAfterMouseDown_FallbackToMouseTarget`
+- `WindowFilter_ExternalCoord_DropsEvent`
+- `WindowFilter_SutCoord_KeepsEvent`
+- `ScenarioWriter_RoundTrip_PreservesKorean`
+
+## 빌드/테스트 결과
+
+- `dotnet build recordingtest.sln` — 0 warning, 0 error (TreatWarningsAsErrors)
+- `dotnet test` — 60 → 71 통과, 0 실패
+
+## 변경 파일
+
+- src/Recordingtest.Player/UiaPathParser.cs (new)
+- src/Recordingtest.Player/IUiaPathResolver.cs (new — `IUiaTreeNode`+`UiaPathResolver`)
+- src/Recordingtest.Player/UiaPlayerHost.cs
+- src/Recordingtest.Recorder/DragCollapser.cs
+- src/Recordingtest.Recorder/ScenarioWriter.cs
+- src/Recordingtest.Recorder/WindowFilter.cs (new)
+- src/Recordingtest.Recorder/NativeMethods.cs (WindowFromPoint/GetForegroundWindow/GetWindowThreadProcessId)
+- src/Recordingtest.Recorder/LowLevelHook.cs (Filter property)
+- src/Recordingtest.Recorder/Program.cs (filter wiring)
+- tests/Recordingtest.Player.Tests/UiaPathResolverTests.cs (new)
+- tests/Recordingtest.Recorder.Tests/RecorderTests.cs (5 새 fact)
+- docs/guides/smoke-test.md (PowerShell UTF-8 팁)
+
+## 다음 단계
+
+- `/evaluate issue-12` (Evaluator)
+- 통과 시 PROGRESS.md/PLAN.md orchestrator가 갱신
+- 실제 SUT 위 smoke 2회차로 box-v4-clean.yaml 재생 검증