init: add source code from src.zip

src/utils/model/aliases.ts

@@ -0,0 +1,25 @@
+export const MODEL_ALIASES = [
+  'sonnet',
+  'opus',
+  'haiku',
+  'best',
+  'sonnet[1m]',
+  'opus[1m]',
+  'opusplan',
+] as const
+export type ModelAlias = (typeof MODEL_ALIASES)[number]
+
+export function isModelAlias(modelInput: string): modelInput is ModelAlias {
+  return MODEL_ALIASES.includes(modelInput as ModelAlias)
+}
+
+/**
+ * Bare model family aliases that act as wildcards in the availableModels allowlist.
+ * When "opus" is in the allowlist, ANY opus model is allowed (opus 4.5, 4.6, etc.).
+ * When a specific model ID is in the allowlist, only that exact version is allowed.
+ */
+export const MODEL_FAMILY_ALIASES = ['sonnet', 'opus', 'haiku'] as const
+
+export function isModelFamilyAlias(model: string): boolean {
+  return (MODEL_FAMILY_ALIASES as readonly string[]).includes(model)
+}