chore: quantlab-agent 프로젝트 초기 설정

agent_guide 템플릿 기반으로 프로젝트 구조 설정.
Gitea(quantlab-agent), Vikunja(project #15) 연동 완료.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.agent/skills/gsd-pr-branch/SKILL.md

@@ -0,0 +1,21 @@
+---
+name: gsd-pr-branch
+description: Create a clean PR branch by filtering out .planning/ commits — ready for code review
+---
+
+
+<objective>
+Create a clean branch suitable for pull requests by filtering out .planning/ commits
+from the current branch. Reviewers see only code changes, not GSD planning artifacts.
+
+This solves the problem of PR diffs being cluttered with PLAN.md, SUMMARY.md, STATE.md
+changes that are irrelevant to code review.
+</objective>
+
+<execution_context>
+@.agent/get-shit-done/workflows/pr-branch.md
+</execution_context>
+
+<process>
+Execute the pr-branch workflow from @.agent/get-shit-done/workflows/pr-branch.md end-to-end.
+</process>