Function export_document

pub fn export_document(
    state: &mut EiteState,
    out_format: &Format,
    dc_array: &[u32],
    prefilter_settings: &PrefilterSettings,
) -> Result<(Vec<u8>, FormatLog)>

Export a document (Dc array) into a named external format.

Thin wrapper over formats::dca_to_format.

Arguments:

• state: Mutable Eite runtime state (collects warnings, caches, settings).
• out_format: Target format identifier (case / spelling must match a registered format).
• dc_array: The in‑memory Dc array representation (sequence of codepoint / symbol IDs).

Returns serialized bytes on success.

Errors:

• Propagates any format‑specific encoding or validation errors.
• Unknown out_format will typically surface as an Err.