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-todo/SKILL.md

@@ -0,0 +1,42 @@
+---
+name: gsd-add-todo
+description: Capture idea or task as todo from current conversation context
+---
+
+
+<objective>
+Capture an idea, task, or issue that surfaces during a GSD session as a structured todo for later work.
+
+Routes to the add-todo workflow which handles:
+- Directory structure creation
+- Content extraction from arguments or conversation
+- Area inference from file paths
+- Duplicate detection and resolution
+- Todo file creation with frontmatter
+- STATE.md updates
+- Git commits
+</objective>
+
+<execution_context>
+@.agent/get-shit-done/workflows/add-todo.md
+</execution_context>
+
+<context>
+Arguments: $ARGUMENTS (optional todo description)
+
+State is resolved in-workflow via `init todos` and targeted reads.
+</context>
+
+<process>
+**Follow the add-todo workflow** from `@.agent/get-shit-done/workflows/add-todo.md`.
+
+The workflow handles all logic including:
+1. Directory ensuring
+2. Existing area checking
+3. Content extraction (arguments or conversation)
+4. Area inference
+5. Duplicate checking
+6. File creation with slug generation
+7. STATE.md updates
+8. Git commits
+</process>