v0.2.0

Breaking

• Replace Grok Imagine image-to-video source_image_urls contract metadata with scalar source_image_url.
  Migration: Validate and send the source image through source_image_url.

Added

• Add shared PHP contract metadata for OpenAI TTS and Fish Audio clients.
• Add model-specific contract validation metadata for Gemini Omni Flash Preview text-to-video requests.
• Publish Gemini TTS model and input contract metadata for Composer packages.
• Publish Seedream 5 Pro model and input contract metadata for Composer packages.
• Publish shared PHP contract metadata for the Producer text-to-music request schema.

Changed

• Publish PHP core contract metadata used by the Midjourney prompt shortening resource.
• Publish Seedream 5-Lite output format contract metadata for Composer packages.
• Publish advanced stem separation mode, stem values, and conditional validation metadata for Composer packages.
• Validate array types and generated minimum and maximum item counts before sending requests.

Fixed

• Publish model-specific contract rules that reject seed for Wan 2.6 video requests.
• Preserve API-provided error codes, leave missing codes unset, and use SDK exception types for local failures.
• Recognize continuation request failures across HTTP 400, 409, 422, 429, and 503 responses.