feat(semantic): native vectorization pipeline + brain import/export#4
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…semantic search, brain import/export
Adds ts/src/semantic.ts: the vector pipeline as a first-class HellGraph capability.
- embedText / cosineSim / chunkText primitives (embed-agnostic via EmbedFn)
- putChunk + vectorizeDocument: store vectors on DocumentChunk atoms (canonical shape)
- semanticSearch(query, k, embed, {scope}): cosine over chunk vectors, lexical fallback
- importBrainShard / exportBrainShard: load/dump precomputed base64-float32 'brain'
- 6 unit tests (incl. idempotency, scope, injected-embedder)
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Adds a native
semanticmodule to HellGraph: embed → vector store on DocumentChunk atoms → cosine semantic search, plus precomputed-vector brain import/export (the offline-embed → inject product edge). Embed-agnostic (inject anyEmbedFn). 6 unit tests pass. Built dist included.