core: add map-reduce ingestion engine#47
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Bottom-up map/reduce over section trees: leaves get mapped, parents reduce over child metadata. Large leaves are chunked on paragraph boundaries before mapping. Concurrency-bounded semaphore prevents deadlocks at concurrency=1.
Parse markdown into a RawSection[] tree using mdast-util-from-markdown. Handles preamble content, nested headings, level skips, and correctly ignores headings inside fenced code blocks. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
ReduceFnandMapReduceOptionstypes tocore/types/ingest.tsmapReduceSections— bottom-up tree walk: leaves are mapped, parents reduce over child metadatamaxSectionSizeare chunked on paragraph boundaries before mappingconcurrency: 1)Supersedes #44 (which targeted the stale refactor branch).
Test plan
bun run typecheck— cleanbun test— 12/12 tests pass (6 flat-map + 6 map-reduce)