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-health/SKILL.md

@@ -0,0 +1,17 @@
+---
+name: gsd-health
+description: Diagnose planning directory health and optionally repair issues
+---
+
+<objective>
+Validate `.planning/` directory integrity and report actionable issues. Checks for missing files, invalid configurations, inconsistent state, and orphaned plans.
+</objective>
+
+<execution_context>
+@.agent/get-shit-done/workflows/health.md
+</execution_context>
+
+<process>
+Execute the health workflow from @.agent/get-shit-done/workflows/health.md end-to-end.
+Parse --repair flag from arguments and pass to workflow.
+</process>