llama.cpp support signals Gemma 4 imminent

Strong signal, not proof. The key signal is ecosystem readiness: if llama.cpp is landing compatibility work, Gemma 4 is close enough that downstream tooling is moving ahead of launch. The PR concerns GGUF conversion for audio and vision mmproj assets, which suggests a more multimodal pipeline than a plain text-only release, and Reddit is treating it as a teaser rather than confirmed news.