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/get-shit-done/templates/dev-preferences.md

@@ -0,0 +1,21 @@
+---
+description: Load developer preferences into this session
+---
+
+# Developer Preferences
+
+> Generated by GSD on {{generated_at}} from {{data_source}}.
+> Run `/gsd-profile-user --refresh` to regenerate.
+
+## Behavioral Directives
+
+Follow these directives when working with this developer. Higher confidence
+directives should be applied directly. Lower confidence directives should be
+tried with hedging ("Based on your profile, I'll try X -- let me know if
+that's off").
+
+{{behavioral_directives}}
+
+## Stack Preferences
+
+{{stack_preferences}}