Add type-safe model names with TypedVoyageAIClient

[ntedvs]

Summary

• Adds strongly-typed model names for all VoyageAI endpoints to prevent runtime errors from invalid model strings
• Introduces TypedVoyageAIClient with full TypeScript autocomplete and validation
• Maintains 100% backward compatibility with existing VoyageAIClient

What's New

• Type-safe model definitions (EmbedModel, RerankModel, etc.) with all current models
• TypedVoyageAIClient - wrapper providing compile-time model validation
• Enhanced DX - IDE autocomplete for model names prevents typos
• Future-proof - won't be overwritten by SDK regeneration

Model Coverage

• Embedding models: voyage-3-large, voyage-3.5, voyage-code-3, etc. (16 models)
• Reranking models: rerank-2.5, rerank-2, rerank-lite-1, etc. (6 models)
• Multimodal: voyage-multimodal-3
• Contextualized: voyage-context-3

Usage Examples

// New: Type-safe with autocomplete
import { TypedVoyageAIClient } from "voyageai";
const client = new TypedVoyageAIClient({ apiKey: "key" });
await client.embed({
  input: "text",
  model: "voyage-3-large" // ✅ Autocomplete + validation
});

// Existing: Still works unchanged
import { VoyageAIClient } from "voyageai";
const client = new VoyageAIClient({ apiKey: "key" });
await client.embed({ input: "text", model: "voyage-3-large" }); // ✅ No changes