feat: AI 어시스턴트 GitHub 템플릿(Issue/PR) 설계 적용 (#450) (#451)

* feat: apply github templates to ai assistant workflows and skills (#450)

* fix: resolve CodeRabbit review comments on AI templates (#450)

* fix: resolve second-round CodeRabbit review comments on manage-skills and PR workflows (#450)

* fix: resolve third-round CodeRabbit review comments on manage-skills (#450)

* fix: resolve fourth-round CodeRabbit review comments on manage-skills (#450)

* fix: resolve fifth-round CodeRabbit review comments (#450)

Author: 023-dev

.agent/skills/github-issue-create/SKILL.md

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+---
+name: github-issue-create
+description: 새로운 작업을 시작하기 위해 "GitHub Issue"를 생성합니다. 사용자가 이슈 생성을 명시적으로 요청하거나, 현재 대화 내용을 바탕으로 "이슈로 등록해줘"라고 할 때 사용하십시오.
+---
+
+# Create GitHub Issue
+
+Helper skill to draft and create GitHub Issues.
+
+## Instructions
+
+1.  **Draft Issue**
+    -   **Context-Based**: If no specific content is provided, analyze the chat history to draft an issue.
+    -   **Format**: Use `markdown`.
+    -   **Language**: **Korean** Only (Technical terms can be English).
+    -   **Structure**: Follow `.github/ISSUE_TEMPLATE` guidelines.
+        -   [FEAT]: `## 📃 요약`, `## 📎 참고 자료 (선택)`
+        -   [BUG]: `## 버그 설명`, `## 버그 발생 상황`, `## 예상 결과`, `## 참고할만한 자료(선택)`
+
+2.  **Review**
+    -   Show the draft to the user for approval.
+
+3.  **Create**
+    -   Use `run_command` with GitHub CLI:
+        ```bash
+        gh issue create --title "제목" --body "내용"
+        ```
+
+    > **Note**: If `gh` CLI is unavailable, provide the content for the user to copy-paste.

.agent/skills/github-pr-comment-resolve/SKILL.md

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+---
+name: github-pr-comment-resolve
+description: PR 리뷰에 달린 코멘트들을 조회하고, 수정 계획을 세우거나 해결(Resolve) 처리를 돕습니다. "리뷰 반영할게", "PR 코멘트 확인해줘" 등의 상황에서 사용하십시오.
+---
+
+# Resolve PR Comments
+
+Systematically address code review comments.
+
+## Steps
+
+1.  **Fetch Comments**
+    -   Get PR number: `gh pr view --json number`
+    -   Get unresolved comments using GraphQL:
+        ```bash
+        gh api graphql -F owner=':owner' -F name=':repo' -F pr=<PR_NUM> -f query='
+        query($owner: String!, $name: String!, $pr: Int!) {
+          repository(owner: $owner, name: $name) {
+            pullRequest(number: $pr) {
+              reviewThreads(last: 50) {
+                nodes {
+                  id
+                  isResolved
+                  path
+                  comments(first: 5) { nodes { body } }
+                }
+              }
+            }
+          }
+        }' --jq '.data.repository.pullRequest.reviewThreads.nodes[] | select(.isResolved == false)'
+        ```
+
+2.  **Analyze & Plan**
+    -   List comments and propose actions (Accept/Question/Refuse).
+
+3.  **Fix & Verify**
+    -   Apply code changes.
+    -   Run verification: `./scripts/check-all.sh`.
+
+4.  **Push**
+    -   `git push origin HEAD`
+
+5.  **Reply & Resolve**
+    -   Reply to comments using `gh api`.
+    -   Resolve threads using GraphQL (advanced) or manual verification.
+
+## Tip
+-   Always verify before pushing.
+-   Write replies in Korean.

.agent/skills/github-pr/SKILL.md

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+---
+name: github-pr
+description: 현재 작업 중인 변경사항을 Git 커밋하고 원격 저장소에 푸시한 뒤, "Pull Request(PR)"를 생성합니다. "작업 끝났어 PR 올려줘", "리뷰 요청할게" 등의 상황에서 사용하십시오.
+---
+
+# Create GitHub PR
+
+Creates a Pull Request for the current work.
+
+## Instructions
+
+1.  **Branch Check**
+    -   If current branch is `main` or `develop`:
+        -   Ask user for branch name (e.g., `feature/...`).
+        -   `git checkout -b <new-branch>`
+    -   Else: Continue.
+
+2.  **Push Changes**
+    -   Ensure all changes are committed.
+    -   `git push origin HEAD`
+
+3.  **Draft PR Body**
+    -   **Format**: Markdown (Korean).
+    -   **Content**: Follow `.github/PULL_REQUEST_TEMPLATE.md`.
+        -   `## #️⃣연관된 이슈`: e.g. `close #ID`.
+        -   `## 📝 작업 내용`: Summary of changes (Why & What).
+        -   (Optional) Test/Verification status.
+        -   `## 🙏 리뷰 요구사항 (선택)`: Specific things to review.
+    -   **Show draft to user**.
+
+4.  **Create PR**
+    -   `gh pr create --base develop --title "제목" --body "본문"`