feat: add descriptions for 5 new models from router

Add Qwen3.5-9B, tiny-aya-global, tiny-aya-earth, tiny-aya-fire,
and tiny-aya-water to prod.yaml and dev.yaml MODELS arrays.

https://claude.ai/code/session_01Cv3ZqNWtFJ9dSbeobd1zLX

Author: claude

chart/env/dev.yaml

@@ -79,6 +79,11 @@ envVars:
   PUBLIC_LLM_ROUTER_ALIAS_ID: "omni"
   MODELS: >
     [
+      { "id": "Qwen/Qwen3.5-9B", "description": "Dense multimodal hybrid with 262K context excelling at reasoning on-device." },
+      { "id": "CohereLabs/tiny-aya-global", "description": "Tiny multilingual assistant covering 70+ languages for on-device deployment." },
+      { "id": "CohereLabs/tiny-aya-earth", "description": "Regional Aya for African languages with culturally tuned on-device inference." },
+      { "id": "CohereLabs/tiny-aya-fire", "description": "Regional Aya for South Asian languages with culturally tuned on-device inference." },
+      { "id": "CohereLabs/tiny-aya-water", "description": "Regional Aya for Asia-Pacific and European multilingual on-device tasks." },
       { "id": "Qwen/Qwen3.5-122B-A10B", "description": "Multimodal MoE excelling at agentic tool use with 1M context and 201 languages." },
       { "id": "Qwen/Qwen3.5-35B-A3B", "description": "Compact multimodal MoE with hybrid DeltaNet, 1M context, and 201 languages." },
       { "id": "Qwen/Qwen3.5-27B", "description": "Dense multimodal hybrid with top-tier reasoning density and 1M context." },

chart/env/prod.yaml

@@ -89,6 +89,11 @@ envVars:
   PUBLIC_LLM_ROUTER_ALIAS_ID: "omni"
   MODELS: >
     [
+      { "id": "Qwen/Qwen3.5-9B", "description": "Dense multimodal hybrid with 262K context excelling at reasoning on-device." },
+      { "id": "CohereLabs/tiny-aya-global", "description": "Tiny multilingual assistant covering 70+ languages for on-device deployment." },
+      { "id": "CohereLabs/tiny-aya-earth", "description": "Regional Aya for African languages with culturally tuned on-device inference." },
+      { "id": "CohereLabs/tiny-aya-fire", "description": "Regional Aya for South Asian languages with culturally tuned on-device inference." },
+      { "id": "CohereLabs/tiny-aya-water", "description": "Regional Aya for Asia-Pacific and European multilingual on-device tasks." },
       { "id": "Qwen/Qwen3.5-122B-A10B", "description": "Multimodal MoE excelling at agentic tool use with 1M context and 201 languages." },
       { "id": "Qwen/Qwen3.5-35B-A3B", "description": "Compact multimodal MoE with hybrid DeltaNet, 1M context, and 201 languages." },
       { "id": "Qwen/Qwen3.5-27B", "description": "Dense multimodal hybrid with top-tier reasoning density and 1M context." },