feat: Variet Engine v1.0 + 5-model tuning complete

Phase 01 (LLM Tuning):
- Gemma4 26B: 74.65 t/s (fast)
- Qwen 35B: 61.62 t/s (balanced)
- Gemma4 31B: 16.0 t/s (deep-coder)
- Qwen 27B: 16.7 t/s (deep-logic)
- Qwen 122B: 8.95 t/s (ultra, GPU 1 only)

Phase 02 (API Engine):
- FastAPI reverse proxy on port 8000
- /engine/switch hot-swap with 503 protection
- config/engine_models.json as single source of truth
- Replaced 4 individual .bat files with unified engine

File cleanup:
- scripts/ 85 files -> 9 + _archive/
- Root .bat files -> _archive/

.planning/phases/01-llm-tuning/VERIFICATION.md

@@ -0,0 +1,23 @@
+# Phase 01: LLM Tuning — Verification Report
+
+## 검증 결과
+
+| # | 모델 | 역할 | 실측 속도 | 컨텍스트 | GPU 구성 | 상태 |
+|:-:|------|------|:--------:|:-------:|----------|:----:|
+| 1 | Gemma 4 26B-A4B Q4_K_M | fast | 74.65 t/s | 256K | 듀얼 | ✅ |
+| 2 | Qwen 3.5 35B-A3B Q4_K_M | balanced | 61.62 t/s | 256K | 듀얼 | ✅ |
+| 3 | Gemma 4 31B Dense Q4_K_M | deep-coder | 16.0 t/s | 192K | 듀얼 | ✅ |
+| 4 | Qwen 3.5 27B Dense Q4_K_M | deep-logic | 16.7 t/s | 256K | 듀얼 | ✅ |
+| 5 | Qwen 3.5 122B-A10B Q4_K_M | ultra | 8.95 t/s | 256K | GPU 1만 | ✅ |
+
+## UAT 기준 달성 여부
+
+- [x] Fast tier ≥ 70 t/s → **74.65 t/s** ✅
+- [x] Balanced tier ≥ 50 t/s → **61.62 t/s** ✅
+- [x] Deep tier 안정 구동 → **16.0 / 16.7 t/s** ✅
+- [x] Ultra tier 구동 가능 → **8.95 t/s** ✅
+- [x] 모든 모델 VRAM 12GB x 2 이내 → ✅
+- [x] 최적 설정값 JSON으로 체계화 → `config/engine_models.json` ✅
+
+## Phase Status: ✅ COMPLETE
+완료 일시: 2026-04-07