agent-platform release v4.99.0

qwen3-5-4b-hf: Qwen3.5 4B from the Hugging Face Hub on one 24 GB GPU (giantswarm/model-manager#98, #106; epic giantswarm/giantswarm#37639). This is the qwen3-5-4b recipe (arguments, resources, fit 9 + 6 GiB) with storageUri: hf://Qwen/Qwen3.5-4B in place of the signed model image. Every other preset that fits a 24 GB card ships as an oci:// model image, which pull_model refuses by design, so the Hub download Job, the model cache claim and a predictor starting from the cache could not run on the smallest GPU pool. An installation serves qwen3-5-4b. verify-gpu-pool leaves a preset added to or retired from the line-up out of its comparison with the golden ref.