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-review/SKILL.md

@@ -0,0 +1,31 @@
+---
+name: gsd-review
+description: Request cross-AI peer review of phase plans from external AI CLIs
+---
+
+
+<objective>
+Invoke external AI CLIs (Gemini, the agent, Codex) to independently review phase plans.
+Produces a structured REVIEWS.md with per-reviewer feedback that can be fed back into
+planning via /gsd-plan-phase --reviews.
+
+**Flow:** Detect CLIs → Build review prompt → Invoke each CLI → Collect responses → Write REVIEWS.md
+</objective>
+
+<execution_context>
+@.agent/get-shit-done/workflows/review.md
+</execution_context>
+
+<context>
+Phase number: extracted from $ARGUMENTS (required)
+
+**Flags:**
+- `--gemini` — Include Gemini CLI review
+- `--claude` — Include the agent CLI review (uses separate session)
+- `--codex` — Include Codex CLI review
+- `--all` — Include all available CLIs
+</context>
+
+<process>
+Execute the review workflow from @.agent/get-shit-done/workflows/review.md end-to-end.
+</process>