Concise monthly summary for 2025-08 (envoyproxy/ai-gateway): This month focused on expanding embedding model interoperability by enabling encodingFormat support and strengthening test coverage. The key feature delivered was flexible encodingFormat support for embeddings, including code changes to the Embedding struct to handle both float arrays and string types, plus a new EmbeddingUnion to manage JSON marshal/unmarshal. A dedicated unit test TestEmbeddingUnionUnmarshal was added to validate unmarshalling of different embedding formats. No major bugs were reported; minor stability and maintenance improvements were performed as part of ongoing hygiene. Overall impact: improved interoperability with embedding models and more robust embedding data handling, reducing runtime encoding/decoding errors and enabling broader use cases. Technologies/skills demonstrated: Go language changes, struct design for union-like types, custom JSON marshaling/unmarshalling, unit testing, commit-driven development (linked to 992ce5042096b791326d025668e3b1ed08745d79).