feat: port khive-retrieval — hybrid retrieval composer#302
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Ports the retrieval orchestration layer from khive-internal. Composes khive-hnsw (vector), khive-bm25 (text), and khive-fusion into a unified hybrid search pipeline with graph traversal, persistence adapters, cross-encoder reranking support, and evaluation harness. Includes prerequisite crates (hnsw, bm25, fusion) and fold objective registry for compilability. Gates on their individual PRs for merge. ~7.1K LOC, tests pass. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Accept main's versions of khive-fusion, khive-bm25, khive-hnsw. Fix clippy: derive Default for ClearanceLevel instead of manual impl. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Weighted fusion is constrained to exactly 2 sources (vector + keyword) by the HybridSearcher trait hierarchy. Add assertion to catch misuse. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
PR #306 relocated ObjectiveRegistry from khive-fold to khive-runtime. This branch predated that change — sync both crates to main. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
Split from #297 (staging). Merge after: #298 (fold), #299 (fusion), #300 (bm25), #301 (hnsw).
Branch includes dep crates for compilability — only the
khive-retrieval/diff matters for review.Test plan
cargo check -p khive-retrievalcleancargo test -p khive-retrieval— all pass🤖 Generated with Claude Code