Restrict OpenCode Zen to kimi-k2.6; revert minimax wiring

Removes opencode/minimax-m2.7 from the OpenCode Zen routing map and
reverts the buffbench main.ts back to base2-free-evals. Drops the two
short-lived base2-free-opencode-{kimi,minimax} agent variants.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: jahooma

agents/base2/base2-free-opencode-kimi.ts

@@ -54,7 +54,6 @@ export type openrouterModel =
   (typeof openrouterModels)[keyof typeof openrouterModels]
 
 export const openCodeZenModels = {
-  opencode_minimax_m2_7: 'opencode/minimax-m2.7',
   opencode_kimi_k2_6: 'opencode/kimi-k2.6',
 } as const
 export type OpenCodeZenModel =

agents/base2/base2-free-opencode-minimax.ts

@@ -11,7 +11,7 @@ async function main() {
   // Use 'external:opencode' for OpenCode CLI
   await runBuffBench({
     evalDataPaths: [path.join(__dirname, 'eval-codebuff.json')],
-    agents: ['base2-free-kimi'],
+    agents: ['base2-free-evals'],
     taskConcurrency: 6,
     saveTraces,
   })

common/src/constants/model-config.ts

@@ -857,7 +857,6 @@ describe('/api/v1/chat/completions POST endpoint', () => {
       'routes OpenCode Zen models to the direct OpenCode Zen provider',
       async () => {
         const expectedUpstreamModel: Record<string, string> = {
-          'opencode/minimax-m2.7': 'minimax-m2.7',
           'opencode/kimi-k2.6': 'kimi-k2.6',
         }
 

evals/buffbench/main.ts

@@ -38,14 +38,6 @@ const OPENCODE_ZEN_MODELS: Record<
   string,
   { opencodeId: string; pricing: OpenCodeZenPricing }
 > = {
-  [openCodeZenModels.opencode_minimax_m2_7]: {
-    opencodeId: 'minimax-m2.7',
-    pricing: {
-      inputCostPerToken: 0.3 / 1_000_000,
-      cachedInputCostPerToken: 0.06 / 1_000_000,
-      outputCostPerToken: 1.2 / 1_000_000,
-    },
-  },
   [openCodeZenModels.opencode_kimi_k2_6]: {
     opencodeId: 'kimi-k2.6',
     pricing: {