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_Strings.md

@@ -0,0 +1,78 @@
+---
+id: java-strings
+title: "Java Strings"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["자바 문자열"]
+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", "strings"]
+raw_sources: ["https://www.w3schools.com/java/java_strings.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Java Strings]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+A Java String is an object with methods, not a raw character array — `length()`, `indexOf()`, `charAt()`, `equals()`, and `trim()` are all method calls (`str.method()`), not built-in functions like Python's `len(str)`. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **String** — a double-quoted, object-based text container in Java (not a primitive). [S1]
+- **`length()`** — returns character count. [S1]
+- **`toUpperCase()` / `toLowerCase()`** — case conversion. [S1]
+- **`indexOf(text)`** — position of the first occurrence (0-indexed). [S1]
+- **`charAt(index)`** — the character at a specific position. [S1]
+- **`equals(other)`** — compares string CONTENT, unlike `==` which compares references. [S1]
+- **`trim()`** — removes leading/trailing whitespace. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Method-call syntax throughout** — every string operation is `str.method()`, contrasting with Python's mix of methods (`str.upper()`) and built-in functions (`len(str)`). [S1]
+- **`equals()` not `==`** — the tutorial specifically teaches `equals()` for string comparison, implying `==` would compare object references rather than content (a classic Java gotcha, though not elaborated here). [S1]
+
+## 📖 세부 내용 (Details)
+- Length: `String txt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; txt.length()`. [S1]
+- Case conversion: `txt.toUpperCase(); txt.toLowerCase();`. [S1]
+- Find position: `String txt = "Please locate where 'locate' occurs!"; txt.indexOf("locate"); // 7`. [S1]
+- Character access: `String txt = "Hello"; txt.charAt(0); // H`. [S1]
+- Content comparison: `txt1.equals(txt2)`. [S1]
+- Trim whitespace: `String txt = " Hello World "; txt.trim(); // "Hello World"`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 이후 Concatenation/Numbers and Strings/Special Characters 챕터에서 문자열 조작이 심화된다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Content comparison with equals() (Java):
+```java
+String txt1 = "Hello";
+String txt2 = "Hello";
+System.out.println(txt1.equals(txt2));  // true
+```
+
+## ✅ 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 Strings Concat]], [[Java Strings Numbers]], [[Java Characters]]
+- **참조 맥락:** 문자열 메서드의 기초 — equals()로 내용 비교(==와 구분)해야 함이 핵심.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Java Strings — https://www.w3schools.com/java/java_strings.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Java Strings" page (Astra wiki-curation, P-Reinforce v3.1 format).