fix(copilot): fire-and-forget model with cache fetch to unblock TUI startup

Author: eastwood

packages/opencode/src/plugin/github-copilot/copilot.ts

@@ -8,6 +8,8 @@ import { CopilotModels } from "./models"
 
 const log = Log.create({ service: "plugin.copilot" })
 
+const modelsCache = new Map<string, Record<string, Model>>()
+
 const CLIENT_ID = "Ov23li8tweQw6odWQebz"
 // Add a small safety buffer when polling to avoid hitting the server
 // slightly too early due to clock skew / timer drift.
@@ -47,17 +49,22 @@ export async function CopilotAuthPlugin(input: PluginInput): Promise<Hooks> {
           return Object.fromEntries(Object.entries(provider.models).map(([id, model]) => [id, fix(model)]))
         }
 
-        return CopilotModels.get(
-          base(ctx.auth.enterpriseUrl),
-          {
-            Authorization: `Bearer ${ctx.auth.refresh}`,
-            "User-Agent": `opencode/${Installation.VERSION}`,
-          },
-          provider.models,
-        ).catch((error) => {
-          log.error("failed to fetch copilot models", { error })
-          return Object.fromEntries(Object.entries(provider.models).map(([id, model]) => [id, fix(model)]))
-        })
+        const url = base(ctx.auth.enterpriseUrl)
+        const key = `${url}:${ctx.auth.refresh}`
+        const headers = {
+          Authorization: `Bearer ${ctx.auth.refresh}`,
+          "User-Agent": `opencode/${Installation.VERSION}`,
+        }
+
+        // Fire-and-forget background refresh (same pattern as models.dev)
+        CopilotModels.get(url, headers, provider.models)
+          .then((result) => modelsCache.set(key, result))
+          .catch((error) => log.error("failed to fetch copilot models", { error }))
+
+        // Return cached result immediately, falling back to static models
+        const cached = modelsCache.get(key)
+        if (cached) return cached
+        return Object.fromEntries(Object.entries(provider.models).map(([id, model]) => [id, fix(model)]))
       },
     },
     auth: {