python/v0.5.0

Added

• Return usage.cost as a float USD amount on completed async Task query and webhook envelopes.
• Accept an optional variation_category (subtle, normal, high) on remaster_audio for suno-v5 and suno-v5.5 targets; the server defaults to normal.

Changed

• remaster_audio's model now selects the target render model; any completed Suno song, from any model version, is accepted as the source.
  Migration: Stop matching the remaster model to the source song's model. Pick a supported target model and pass the source task and audio ids as before.
• generate_artwork accepts only completed music generation tasks (text_to_music) as its source; extend or upload tasks are rejected with a clear error.

Removed

• Remove the public Task billing object from Task envelopes.
  Migration: Read usage.cost on completed Task envelopes. Create, processing, and failed envelopes omit usage.