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-next/SKILL.md

@@ -0,0 +1,19 @@
+---
+name: gsd-next
+description: Automatically advance to the next logical step in the GSD workflow
+---
+
+<objective>
+Detect the current project state and automatically invoke the next logical GSD workflow step.
+No arguments needed — reads STATE.md, ROADMAP.md, and phase directories to determine what comes next.
+
+Designed for rapid multi-project workflows where remembering which phase/step you're on is overhead.
+</objective>
+
+<execution_context>
+@.agent/get-shit-done/workflows/next.md
+</execution_context>
+
+<process>
+Execute the next workflow from @.agent/get-shit-done/workflows/next.md end-to-end.
+</process>