opencode: local agents to qwen3.8-27b-gsq-s at MEDIUM reasoning

dev, architect, review, duck and brainstorm move from
litellm/muse-glimmer-30b-low to litellm/qwen3.8-27b-gsq-s-med, in both the
local-only and personal profiles. Glimmer's model entries are left in place so
reverting is a one-line change.

⚠ MEDIUM, not low -- do not "align" this with the -low convention Glimmer uses.
Qwen's own model card: "lower reasoning effort does not always reduce overall
task completion time" on multi-turn agentic work, because insufficient analysis
causes more failed actions and retries, raising latency AND total tokens. The
low-effort result that justifies muse-glimmer-30b-low was measured on Glimmer
and does not transfer.

⚠ The key is reasoning_effort, NOT Glimmer's reasoning_strength. The wrong key
is dropped by kwarg filtering before it reaches the template, returns 200, and
silently leaves the model at its default -- which for qwen3.8 is xhigh. Levels
are low / medium / xhigh; there is no `high`.

Verified the control actually moves rather than merely being accepted:
171 reasoning tokens at low against 430 at medium on one prompt.

Requires qwen3.8-27b-gsq-s-med in ~/config/litellm/config.yaml (untracked;
snapshot at config.yaml.pre-qwen38low).

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FZomrX5fYmPYLusxcXTwvq

common/opencode/local.json

@@ -87,6 +87,32 @@
             "cache_write": 0.0
           }
         },
+        "qwen3.8-27b-gsq-s-low": {
+          "name": "Qwen3.8-27B GSQ IQ3_S (local, low reasoning)",
+          "limit": {
+            "context": 131072,
+            "output": 8192
+          },
+          "cost": {
+            "input": 0.0,
+            "output": 0.0,
+            "cache_read": 0.0,
+            "cache_write": 0.0
+          }
+        },
+        "qwen3.8-27b-gsq-s-med": {
+          "name": "Qwen3.8-27B GSQ IQ3_S (local, medium reasoning)",
+          "limit": {
+            "context": 131072,
+            "output": 8192
+          },
+          "cost": {
+            "input": 0.0,
+            "output": 0.0,
+            "cache_read": 0.0,
+            "cache_write": 0.0
+          }
+        },
         "muse-glimmer-30b": {
           "name": "Muse Glimmer 30B (local, full reasoning - slow)",
           "limit": {
@@ -110,19 +136,19 @@
   "small_model": "litellm/local/librarian",
   "agent": {
     "dev": {
-      "model": "litellm/muse-glimmer-30b-low"
+      "model": "litellm/qwen3.8-27b-gsq-s-med"
     },
     "architect": {
-      "model": "litellm/muse-glimmer-30b-low"
+      "model": "litellm/qwen3.8-27b-gsq-s-med"
     },
     "review": {
-      "model": "litellm/muse-glimmer-30b-low"
+      "model": "litellm/qwen3.8-27b-gsq-s-med"
     },
     "duck": {
-      "model": "litellm/muse-glimmer-30b-low"
+      "model": "litellm/qwen3.8-27b-gsq-s-med"
     },
     "brainstorm": {
-      "model": "litellm/muse-glimmer-30b-low"
+      "model": "litellm/qwen3.8-27b-gsq-s-med"
     }
   }
 }

common/opencode/personal.json

@@ -397,6 +397,32 @@
             "cache_write": 0.0
           }
         },
+        "qwen3.8-27b-gsq-s-low": {
+          "name": "Qwen3.8-27B GSQ IQ3_S (local, low reasoning)",
+          "limit": {
+            "context": 131072,
+            "output": 8192
+          },
+          "cost": {
+            "input": 0.0,
+            "output": 0.0,
+            "cache_read": 0.0,
+            "cache_write": 0.0
+          }
+        },
+        "qwen3.8-27b-gsq-s-med": {
+          "name": "Qwen3.8-27B GSQ IQ3_S (local, medium reasoning)",
+          "limit": {
+            "context": 131072,
+            "output": 8192
+          },
+          "cost": {
+            "input": 0.0,
+            "output": 0.0,
+            "cache_read": 0.0,
+            "cache_write": 0.0
+          }
+        },
         "muse-glimmer-30b": {
           "name": "Muse Glimmer 30B (local, full reasoning - slow)",
           "limit": {
@@ -423,19 +449,19 @@
   ],
   "agent": {
     "dev": {
-      "model": "litellm/muse-glimmer-30b-low"
+      "model": "litellm/qwen3.8-27b-gsq-s-med"
     },
     "architect": {
-      "model": "litellm/muse-glimmer-30b-low"
+      "model": "litellm/qwen3.8-27b-gsq-s-med"
     },
     "review": {
-      "model": "litellm/muse-glimmer-30b-low"
+      "model": "litellm/qwen3.8-27b-gsq-s-med"
     },
     "duck": {
-      "model": "litellm/muse-glimmer-30b-low"
+      "model": "litellm/qwen3.8-27b-gsq-s-med"
     },
     "brainstorm": {
-      "model": "litellm/muse-glimmer-30b-low"
+      "model": "litellm/qwen3.8-27b-gsq-s-med"
     }
   }
 }