Initial commit: Add project files

docs/templates/SLICE_SPEC.md

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+# Slice Spec: <VS-ID> <Name>
+
+- Requirement ID:
+- Policy/Data/Screen ID:
+- 사용자 결과:
+- 비목표:
+- 권한/Capability:
+- 선행 데이터와 PIT cutoff:
+- 상태전이:
+- Endpoint/Event/Job:
+- DB Migration/Read Model:
+- Idempotency/Concurrency:
+- Given/When/Then:
+- Tests:
+- Metrics/Alerts:
+- Runbook/Rollback:
+- Owner/Secondary:
+- Source:
+- Assumption:
+- Unknown/Decision Required: