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-new-milestone/SKILL.md

@@ -0,0 +1,38 @@
+---
+name: gsd-new-milestone
+description: Start a new milestone cycle — update PROJECT.md and route to requirements
+---
+
+<objective>
+Start a new milestone: questioning → research (optional) → requirements → roadmap.
+
+Brownfield equivalent of new-project. Project exists, PROJECT.md has history. Gathers "what's next", updates PROJECT.md, then runs requirements → roadmap cycle.
+
+**Creates/Updates:**
+- `.planning/PROJECT.md` — updated with new milestone goals
+- `.planning/research/` — domain research (optional, NEW features only)
+- `.planning/REQUIREMENTS.md` — scoped requirements for this milestone
+- `.planning/ROADMAP.md` — phase structure (continues numbering)
+- `.planning/STATE.md` — reset for new milestone
+
+**After:** `/gsd-plan-phase [N]` to start execution.
+</objective>
+
+<execution_context>
+@.agent/get-shit-done/workflows/new-milestone.md
+@.agent/get-shit-done/references/questioning.md
+@.agent/get-shit-done/references/ui-brand.md
+@.agent/get-shit-done/templates/project.md
+@.agent/get-shit-done/templates/requirements.md
+</execution_context>
+
+<context>
+Milestone name: $ARGUMENTS (optional - will prompt if not provided)
+
+Project and milestone context files are resolved inside the workflow (`init new-milestone`) and delegated via `<files_to_read>` blocks where subagents are used.
+</context>
+
+<process>
+Execute the new-milestone workflow from @.agent/get-shit-done/workflows/new-milestone.md end-to-end.
+Preserve all workflow gates (validation, questioning, research, requirements, roadmap approval, commits).
+</process>