Function compile_developmental_asset 

pub fn compile_developmental_asset(
    source_bytes: &[u8],
    hint: Option<&str>,
    asset_uri: &str,
    source_format: &str,
    gestational_age_days: u16,
    carnegie_stage: u8,
) -> Result<CompiledAsset, Compile10dError>

Like compile_asset but binds the compiled asset to a point on the developmental t-axis — its gestational_age_days (postfertilization) and carnegie_stage. This is the compile step for a fetal/ embryonic stage: consecutive stages, ordered by gestational age, form a 4-D developmental body (the maternal–fetal dyad’s fetal side, reproductive-continuum plan §2).