Adds a DreamVerse generation backend for Cosmos Predict 2.5 DFD video-to-world continuation (cosmos25_dfd_generation.py), its config wiring and worker hook, README notes, and tests.
This PR stacked on #1767, which landed first with the review fixes for the Cosmos 2.5 pipelines; what lands here is the DreamVerse integration only. The fixes requested in this PR's maintainer review (Swarm order #748: shared fps, FloatingPointError on non-finite rollouts, DFD detector anchoring, 24 fps defaults, FP64 distilled rollout) all reached main through #1767.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>