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Add AsciiDoc input support

Add AsciiDoc input support: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). Docling can already ingest a handful of "declarative" formats (HTML, Word, PowerPoint) — formats that can be turned straight into a DoclingDocument without running a recognition pipeline…

The task

Docling can already ingest a handful of "declarative" formats (HTML, Word, PowerPoint) — formats that can be turned straight into a `DoclingDocument` without running a recognition pipeline. We want to add **AsciiDoc** as a first-class input format alongside those.

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.