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/profiles/incident-postmortem.yaml

@@ -0,0 +1,20 @@
+id: incident-postmortem
+register: formal
+use_when: 장애의 영향, 탐지, 복구, 원인과 재발 방지를 공개 가능한 범위에서 설명할 때
+required_sections:
+  - incident_summary
+  - user_impact
+  - detection_and_timeline
+  - technical_cause
+  - contributing_factors
+  - recovery
+  - corrective_actions
+optional_sections:
+  - what_worked
+  - what_did_not_work
+  - follow_up_metrics
+rules:
+  blameless_system_focus: true
+  preserve_uncertainty: true
+  never_expose_sensitive_or_unpublished_details: true
+  do_not_name_individuals_unless_required_and_authorized: true