The committed default configuration, embedded into the binary at compile time.

Both the default-policy build (defaultPolicy) and the merged configuration load (loadConfig) read the same config/default.yaml. Embedding it once here gives them a single shared binding instead of two independent Template Haskell splices, and confines the one accepted STAN-0212 (unsafe-function) observation the embedFile splice expands to. Because this module carries nothing but the embed, its source lines never shift, so the .stan.toml exclude can be scoped to the file itself rather than pinned to a line and column that rots on every edit above it.