chat: curate OpenCode models to Big Pickle + Claude Haiku

The full `opencode models` catalog is ~58 entries; surface only opencode/big-pickle
and opencode/claude-haiku-4-5 in the picker for now via an allow-list. Easy to extend.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/servers/api/chat/list-models.ts

@@ -11,6 +11,9 @@ const CLAUDE_CODE_MODELS: ModelInfo[] = [
 
 const OPENCODE_BIN = process.env.OPENCODE_BIN || join(homedir(), '.opencode', 'bin', 'opencode');
 
+// Curated OpenCode models to surface in the picker (the full `opencode models` catalog is ~58 entries).
+const OPENCODE_ALLOWLIST = new Set(['opencode/big-pickle', 'opencode/claude-haiku-4-5']);
+
 // Cache the OpenCode catalog; it's stable for a session and `opencode models` costs a subprocess.
 let openCodeCache: ModelInfo[] | null = null;
 
@@ -33,7 +36,7 @@ async function listOpenCodeModels(): Promise<ModelInfo[]> {
       .replace(/\x1b\[[0-9;]*m/g, '')
       .split('\n')
       .map((line) => line.trim())
-      .filter((line) => line.includes('/'))
+      .filter((line) => OPENCODE_ALLOWLIST.has(line))
       .map((full) => {
         const slash = full.indexOf('/');
         return {