Reads entire Dockerfile / Dockerfile.* / *.dockerfile content and emits a
single Chunk with symbol "<dockerfile>", code_lang "dockerfile", line range
1..EOF. Oversize >200 lines splits into line-windows sharing the symbol via
tier2_shared::push_chunks_with_oversize.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
