chore(session): pause work — Qwen promoted to primary + Hermes v0.8.0

Engine:
- default_role: fast → balanced (Qwen 3.5 35B primary)
- balanced: remove -t/-tb (no impact with -ngl 999)

Hermes Agent submodule:
- Update fff237e1 → e902e55b (v0.8.0, 340 commits merged)
- Local 8 file patches auto-merged (stash/pop, 0 conflicts)
- mmproj CPU offload, DISCORD_HOME_CHANNEL fix via external ~/.hermes/config.yaml

Decisions:
- Speculative decoding experiment rejected (+14% gen vs -31% cold start)
- llama.cpp kept at b8660 (b8757 has 9% Gemma 4 regression)
- Qwen superior for thinking/Korean/coding; speed diff negligible

Session handoff: .planning/HANDOFF.json

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

config/engine_models.json

@@ -1,6 +1,6 @@
 {
   "version": "1.0",
-  "default_role": "fast",
+  "default_role": "balanced",
   "llama_server": {
     "path": "llama_bin_run/llama-server.exe",
     "internal_port": 8080,
@@ -62,10 +62,6 @@
         "256",
         "-b",
         "512",
-        "-t",
-        "6",
-        "-tb",
-        "6",
         "-ts",
         "0.48,0.52"
       ]