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-add-tests/SKILL.md

@@ -0,0 +1,28 @@
+---
+name: gsd-add-tests
+description: Generate tests for a completed phase based on UAT criteria and implementation
+---
+
+<objective>
+Generate unit and E2E tests for a completed phase, using its SUMMARY.md, CONTEXT.md, and VERIFICATION.md as specifications.
+
+Analyzes implementation files, classifies them into TDD (unit), E2E (browser), or Skip categories, presents a test plan for user approval, then generates tests following RED-GREEN conventions.
+
+Output: Test files committed with message `test(phase-{N}): add unit and E2E tests from add-tests command`
+</objective>
+
+<execution_context>
+@.agent/get-shit-done/workflows/add-tests.md
+</execution_context>
+
+<context>
+Phase: $ARGUMENTS
+
+@.planning/STATE.md
+@.planning/ROADMAP.md
+</context>
+
+<process>
+Execute the add-tests workflow from @.agent/get-shit-done/workflows/add-tests.md end-to-end.
+Preserve all workflow gates (classification approval, test plan approval, RED-GREEN verification, gap reporting).
+</process>