Function process_streaming 

pub fn process_streaming(
    content: Bytes,
    initial_batch_size: usize,
    max_batch_size: usize,
    opening_filter: OpeningFilterMode,
    tessellation_quality: TessellationQuality,
    admission: Option<AdmissionGuard>,
) -> Pin<Box<dyn Stream<Item = StreamEvent> + Send>>

Generate streaming geometry events backed by the canonical pipeline.

Takes the raw IFC bytes (issue #1023): localized non-UTF-8 byte sequences in the HEADER must not block otherwise valid models, so no String conversion happens anywhere on this path.