docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합

이전 재구성 작업에서 Dev/ 폴더가 누락되었던 것을 반영.

- Dev/Topic_Programming(중첩 폴더, 78개)은 Dev 자체 최상위 폴더들
  (Architecture/Conventions/Engineering_Intelligence 등)과 완전 중복이라 제거.
- Dev 최상위 엔지니어링 지식 폴더(Architecture/Conventions/Engineering_Intelligence/
  Failure_Library/Generalized_Principles/Language/Pattern_Catalog/Platform_Guides/
  Subsystems, 77개)는 이미 Topic_Programming/Topic_Programming에 더 최신 버전이
  존재해 중복 제거(고유 콘텐츠 1개는 예외 처리하여 이동 보존).
- Dev의 W3Schools 언어 튜토리얼 폴더(Topic_C/CPP/CSS/CSharp/HOWTO/HTML/Java/
  JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동.
- 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리.
- Topic_Programming 최종 문서 수: 2784 → 3985.

10_Wiki/Topic_Programming/Topic_CSharp/CSharp_Conditions_ElseIf.md

@@ -0,0 +1,77 @@
+---
+id: csharp-conditions-elseif
+title: "C# The else if Statement"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["else if statement C#", "C# else if 문"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.82
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["csharp", "programming-language", "w3schools", "conditions", "elseif"]
+raw_sources: ["https://www.w3schools.com/cs/cs_conditions_elseif.php"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CSharp Conditions ElseIf]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+`else if` is not a distinct keyword in C# any more than in C/C++/Java — it's just an `else` block whose body happens to be another `if` statement, which the three-way morning/day/evening example makes visible: each additional `else if` is really nested inside the previous `else`, and the chain only terminates in a plain `else` when every prior condition has failed, evaluated strictly top-to-bottom with short-circuit stopping at the first true condition. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`else if`** — tests a NEW condition only when all prior conditions in the chain were false. [S1]
+- **Syntax**: `if (condition1) {...} else if (condition2) {...} else {...}` — any number of `else if` blocks can be chained between the initial `if` and the final `else`. [S1]
+- **Top-to-bottom, first-match evaluation** — conditions are checked in order; the first one that's true runs its block and the rest of the chain is skipped entirely. [S1]
+
+## 📖 세부 내용 (Details)
+- Three-branch time-of-day example: `int time = 22; if (time < 10) { Console.WriteLine("Good morning."); } else if (time < 20) { Console.WriteLine("Good day."); } else { Console.WriteLine("Good evening."); }` — since `22` is not `< 10` (condition1 false) and not `< 20` (condition2 also false), execution falls through to the final `else`, printing `"Good evening."`. [S1]
+- The tutorial notes that if `time` were `14` instead, the program would print `"Good day."` (condition2 would be true). [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **else if는 별도 키워드가 아니라 else의 본문이 if인 구조**: C/C++/Java와 마찬가지로 C#의 else if 체인도 실제로는 else 블록 안에 또 다른 if가 중첩된 구조라는 점이 삼단계 시간대 예제(morning/day/evening)로 다시 확인됨 — 문법적 특수 케이스가 아니라 else+if의 자연스러운 조합. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+아침/낮/저녁 인사말을 시간(time) 값에 따라 세 가지로 분기하는 예제가 원문에서 직접 실전 활용 사례로 제시됨. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Chained else-if — first true condition wins, rest skipped (C#):
+```csharp
+int time = 22;
+if (time < 10)
+{
+    Console.WriteLine("Good morning.");
+}
+else if (time < 20)
+{
+    Console.WriteLine("Good day.");
+}
+else
+{
+    Console.WriteLine("Good evening.");
+}
+// Outputs "Good evening."
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
+- **신뢰 점수:** 0.82
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[C# Tutorial]]
+- **관련 개념:** [[CSharp Conditions Else]], [[CSharp Conditions Shorthand]], [[CSharp Switch]]
+- **참조 맥락:** Conditions 섹션 — Short Hand If...Else 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — C# The else if Statement — https://www.w3schools.com/cs/cs_conditions_elseif.php
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "C# The else if Statement" page (Astra wiki-curation, P-Reinforce v3.1 format).