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-ui-phase/SKILL.md

@@ -0,0 +1,24 @@
+---
+name: gsd-ui-phase
+description: Generate UI design contract (UI-SPEC.md) for frontend phases
+---
+
+<objective>
+Create a UI design contract (UI-SPEC.md) for a frontend phase.
+Orchestrates gsd-ui-researcher and gsd-ui-checker.
+Flow: Validate → Research UI → Verify UI-SPEC → Done
+</objective>
+
+<execution_context>
+@.agent/get-shit-done/workflows/ui-phase.md
+@.agent/get-shit-done/references/ui-brand.md
+</execution_context>
+
+<context>
+Phase number: $ARGUMENTS — optional, auto-detects next unplanned phase if omitted.
+</context>
+
+<process>
+Execute @.agent/get-shit-done/workflows/ui-phase.md end-to-end.
+Preserve all workflow gates.
+</process>