feat: port khive-fusion — RRF + Weighted + Union retrieval fusion#299
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Ports fusion strategies from khive-internal. Provides RRF (Reciprocal Rank Fusion), weighted linear combination, and union strategies for merging ranked result lists from heterogeneous retrieval sources. ~1.5K LOC, 5 tests. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2 tasks
- Remove unused deps (khive-types, serde_json, thiserror) from Cargo.toml - Remove unverified Lean4 proof claim from crate description - Replace PROOF CORRESPONDENCE comments with Property annotations - Fix incorrect ADR-002 references (ADR-002 is edge ontology, not fusion) - Fix Box::leak memory leak in test_rrf_large_number_of_results - Document silent weight-mismatch behavior in weighted_fusion Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
Split from #297 (staging). Leaf crate — no deps on other new crates.
Test plan
cargo check -p khive-fusioncleancargo test -p khive-fusion— 5 passed🤖 Generated with Claude Code