refactor(topics): 멀티 에이전트용 지식 재편 — _Common(공통 기본기) + Domain_* 구조

에이전트 8종(대화형/프로그래머 C·S/디자이너/설계자/기획자/QA/PD/PM)에게
[공통 기본 능력 + 롤별 Specialty] 2층으로 지식을 주입하기 위한 재분류.
문서 내용·포맷은 무수정, 폴더 이동만 (6,372개 문서 수 보존 확인).

- Topic_Programming → Domain_Programming (내부 구조 보존)
- Topic_Graphic → Domain_Design
- Topic_Business → Domain_Product
- Topic_General → Domain_General
- _Common 신설: Math(구 Topic_Math_Specialty), Reasoning(구 General/From_Thinking & Reasoning),
  Reasoning_Creativity(구 General/From_창의성), Communication(Poetic_Blog_Writing + From_writing)
- 타 도메인의 From_* 폴더는 유지 (출처 표기일 뿐, 이미 도메인에 맞게 분류된 문서)
- 빈 폴더 정리 (memory/procedures)
- 에이전트→폴더 매핑은 workspace의 .astra/agent-knowledge-map.json (9개 에이전트)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

10_Wiki/Topics/Domain_Programming/Topic_Java/Java_Abstraction.md

@@ -0,0 +1,77 @@
+---
+id: java-abstraction
+title: "Java Abstraction"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["abstract classes", "자바 추상화"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.9
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["java", "programming", "w3schools", "oop", "abstraction", "abstract-class"]
+raw_sources: ["https://www.w3schools.com/java/java_abstract.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Java Abstraction]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+An abstract class can freely mix abstract methods (no body) and regular concrete methods (`sleep()` with a real implementation) in the same class — abstraction isn't all-or-nothing; a class can force subclasses to implement SOME behavior while providing shared behavior for the rest. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Abstraction** — hiding implementation details, showing only essential information to the user. [S1]
+- **Two mechanisms** — abstract classes or interfaces (interfaces covered next chapter). [S1]
+- **Abstract class** — cannot be instantiated directly; must be inherited to be used. [S1]
+- **Abstract method** — declared in an abstract class, has no body; the subclass supplies the body. [S1]
+- **Mixed abstract class** — can contain BOTH abstract methods and fully-implemented regular methods. [S1]
+
+## 📖 세부 내용 (Details)
+- Abstract class definition: `abstract class Animal { public abstract void animalSound(); public void sleep() { System.out.println("Zzz"); } }`. [S1]
+- Cannot instantiate: `Animal myObj = new Animal(); // error`. [S1]
+- Subclass provides the body: `class Pig extends Animal { public void animalSound() { System.out.println("The pig says: wee wee"); } } ... Pig myPig = new Pig(); myPig.animalSound(); myPig.sleep();`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 보안(중요 세부사항만 노출)을 위한 설계 원칙으로 소개된다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Abstract class mixing abstract and regular methods (Java):
+```java
+abstract class Animal {
+    public abstract void animalSound(); // no body
+    public void sleep() {               // regular method
+        System.out.println("Zzz");
+    }
+}
+class Pig extends Animal {
+    public void animalSound() {
+        System.out.println("The pig says: wee wee");
+    }
+}
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
+- **신뢰 점수:** 0.90
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[Java Tutorial]]
+- **관련 개념:** [[Java Non Access Modifiers]], [[Java Polymorphism]], [[Java Interface]]
+- **참조 맥락:** 인터페이스와 함께 추상화를 달성하는 두 방법 중 하나 — Interface 챕터로 직접 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Java Abstraction — https://www.w3schools.com/java/java_abstract.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Java Abstraction" page (Astra wiki-curation, P-Reinforce v3.1 format).