diff --git a/Session-2026-04-11.-.md b/Session-2026-04-11.-.md
new file mode 100644
index 0000000..78ce524
--- /dev/null
+++ b/Session-2026-04-11.-.md
@@ -0,0 +1,67 @@
+# Session 2026-04-11 — Phase 01 Retuning & Hermes Agent v0.8.0
+
+**Type**: Maintenance
+**Focus**: LLM tuning re-verification, Hermes Agent update, primary model switch
+
+---
+
+## Summary
+
+Phase 01 (LLM Tuning) 재검증 세션과 Hermes Agent 주요 업데이트를 병행하여 진행. 두 LLM 역할 최적화 파라미터 갱신 및 Qwen 3.5 35B를 메인 모델로 승격, Hermes Agent v0.7.x → v0.8.0 업데이트 완료.
+
+## Key Outcomes
+
+### LLM Engine
+- **balanced** (Qwen 3.5 35B-A3B): 61.62 → **64.16 t/s** (+4.1%)
+- **fast** (Gemma 4 26B-A4B): 74.65 → **71.89 t/s** (Vision GPU 추가 trade-off)
+- Default role: `fast` → `balanced`
+- 두 역할 모두 `--mlock/--poll/--prio/-t/-tb` 제거
+
+### Qwen Primary Promotion
+- 속도 차이 1.25 t/s (negligible)
+- 35B > 26B 품질 우위
+- Thinking mode + 한국어/코딩 강점
+- Vision CPU 오프로드 수용 (6.4s/image)
+
+### Hermes Agent
+- 버전: `fff237e1` → `e902e55b` (340 commits, v0.8.0)
+- 로컬 8개 패치 자동 병합 (0 conflict)
+- 설정: `custom/qwen3.5-35b-a3b` + `DISCORD_HOME_CHANNEL` 수동 설정
+
+## Experiments (Not Adopted)
+
+- **Speculative Decoding** (E2B draft): +14% gen vs -31% cold start → 채택 안 함
+- **llama.cpp b8757**: Gemma 4 9% 회귀 → b8660 유지
+
+## Files Changed
+
+- `config/engine_models.json`
+- `docs/v3_balanced_retuning_log.md` (new)
+- `docs/v3_fast_retuning_log.md` (new)
+- `.planning/reports/20260411-session-report.md` (new)
+- `.planning/phases/01-llm-tuning/VERIFICATION.md` (updated)
+- `.planning/STATE.md` (updated)
+- `.planning/HANDOFF.json` (updated)
+- `agents/hermes-agent` (submodule bump)
+- `scripts/bench_short.py`, `bench_long.py`, `test_ts_ratios.py` (new utilities)
+
+## Git History
+
+```
+e02626f chore(session): pause work — Qwen promoted to primary + Hermes v0.8.0
+0dee779 refactor(phase-01): v3 retune fast & balanced roles
+```
+
+## Hardware Constraints Documented
+
+- GPU 0: PCIe 3.0 x4 (3.94 GB/s) — bottleneck
+- GPU 1: PCIe 4.0 x16 (31.5 GB/s)
+- Total VRAM: 24 GB (2x RTX 3060 12GB)
+
+## Next Session
+
+- Run `/gsd-resume-work` to reload state from `HANDOFF.json`
+- Options:
+  - Start Hermes Agent (`run_hermes_agent.bat`)
+  - Resume Phase 05 (VS Code Extension Packaging)
+  - New feature development