Re-implement token caching for Vercel AI SDK usage #60
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This PR implements token caching for the Vercel AI SDK with Anthropic provider. It adds the appropriate providerOptions.anthropic.cacheControl: 'ephemeral' property to the last two messages in the conversation, which allows the conversation up to that point to be cached (with a ~5 minute window), reducing token consumption during repeated API calls.\n\nFixes #58