fix: map all model_preference values to LiteLLM router groups

Added balanced/economy/local groups alongside fast/quality so all 5
agent model_preference values resolve to real provider groups.
All default to local Ollama qwen3:32b, commercial as fallback.

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

packages/llm-pool/llm_pool/router.py

@@ -28,15 +28,46 @@ logger = logging.getLogger(__name__)
 # Model list — three entries across two groups
 # ---------------------------------------------------------------------------
 _model_list: list[dict] = [
-    # fast group — local Ollama, no API cost
+    # ── local group — Ollama, no API cost ──
     {
-        "model_name": "fast",
+        "model_name": "local",
         "litellm_params": {
-            "model": "ollama/qwen3:8b",
+            "model": "ollama/qwen3:32b",
             "api_base": settings.ollama_base_url,
         },
     },
-    # quality group — Anthropic primary
+    # ── fast group — same as local (aliases for preference mapping) ──
+    {
+        "model_name": "fast",
+        "litellm_params": {
+            "model": "ollama/qwen3:32b",
+            "api_base": settings.ollama_base_url,
+        },
+    },
+    # ── economy group — local model, cheaper than commercial ──
+    {
+        "model_name": "economy",
+        "litellm_params": {
+            "model": "ollama/qwen3:32b",
+            "api_base": settings.ollama_base_url,
+        },
+    },
+    # ── balanced group — Ollama primary, commercial fallback ──
+    {
+        "model_name": "balanced",
+        "litellm_params": {
+            "model": "ollama/qwen3:32b",
+            "api_base": settings.ollama_base_url,
+        },
+    },
+    {
+        "model_name": "balanced",
+        "litellm_params": {
+            "model": "anthropic/claude-sonnet-4-20250514",
+            "api_key": settings.anthropic_api_key,
+        },
+    },
+    # ── quality group — Anthropic primary, OpenAI fallback ──
     {
         "model_name": "quality",
         "litellm_params": {
@@ -44,7 +75,6 @@ _model_list: list[dict] = [
             "api_key": settings.anthropic_api_key,
         },
     },
-    # quality group — OpenAI fallback (within the same group)
     {
         "model_name": "quality",
         "litellm_params": {
@@ -60,7 +90,7 @@ _model_list: list[dict] = [
 llm_router = Router(
     model_list=_model_list,
     # If all quality providers fail, fall back to the fast group
-    fallbacks=[{"quality": ["fast"]}],
+    fallbacks=[{"quality": ["fast"]}, {"balanced": ["fast"]}],
     routing_strategy="latency-based-routing",
     num_retries=2,
     set_verbose=False,