feat: install korean technical blog skill bundle

.agents/skills의 technical-document-author,
revising-korean-technical-prose, writing-natural-korean을
korean-technical-blog-skills-bundle-v1의 세 스킬로 교체한다.

- writing-korean-technical-blogs: 문제·제약·선택·구현·결과·한계 구조화
- reducing-ai-like-korean-writing: 상투성·추상화·반복 제거
- editing-korean-grammar-and-expression: 맞춤법·띄어쓰기·호응 검수

상류를 수정하지 않고 복사했다. diff -r 0건, MANIFEST.sha256 검증 통과,
번들 validate_skill.py 3/3 PASS.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

.agents/skills/writing-korean-technical-blogs/schemas/rubric.schema.json

@@ -0,0 +1,55 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "KoreanTechnicalBlogRubric",
+  "type": "object",
+  "required": [
+    "case_id",
+    "hard_gate_passed",
+    "scores",
+    "total",
+    "verdict",
+    "notes"
+  ],
+  "properties": {
+    "case_id": {
+      "type": "string"
+    },
+    "hard_gate_passed": {
+      "type": "boolean"
+    },
+    "scores": {
+      "type": "object",
+      "required": [
+        "factual_fidelity",
+        "structure_and_audience",
+        "korean_language",
+        "technical_evidence",
+        "brand_consistency",
+        "naturalness"
+      ],
+      "additionalProperties": {
+        "type": "number",
+        "minimum": 0
+      }
+    },
+    "total": {
+      "type": "number",
+      "minimum": 0,
+      "maximum": 100
+    },
+    "verdict": {
+      "enum": [
+        "pass",
+        "fail",
+        "needs_review"
+      ]
+    },
+    "notes": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      }
+    }
+  },
+  "additionalProperties": false
+}