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* feat(ruvector): RaBitQ unbiased distance estimator (ADR-156 M2) Implement the real Gao & Long (SIGMOD 2024) RaBitQ contribution on top of the existing Pass-2 rotation: an unbiased estimator of the inner product / squared distance recovered from the 1-bit code plus 8 B/vec per-vector side info (residual_norm + x_dot_o), used to rerank the candidate set instead of raw Hamming. - src/estimator.rs (new): EstimatorSketch, SideInfo, EstimatorQuery, DistanceEstimator (estimate_inner_product / estimate_sq_distance / ranking_key / cosine_ranking_key), EstimatorBank (topk_estimated[_cosine], with_centroid). Zero-centroid simplification documented; paper-faithful centroid path also built. - src/rotation.rs: extract apply_padded() (full padded FHT frame the code lives in); apply() now truncates apply_padded(). No behaviour change. - lib.rs: export estimator types. Additive + backward-compatible: Pass-1 Sketch / Pass-2 SketchBank / WireSketch wire format unchanged; all external callers use Pass-1 and are unaffected. Co-Authored-By: claude-flow <ruv@ruv.net> * test(ruvector): estimator strict-K coverage harness (ADR-156 M2) Add measure_estimator (cosine rerank) + measure_estimator_euclidean to the coverage harness, on the BIT-IDENTICAL fixture / cluster centres / query stream / cosine ground truth as measure_pass1/measure_pass2 — apples-to-apples sign-Hamming vs unbiased-estimator-rerank. Regression tests: - estimator_rerank_not_worse_than_sign (>= sign-only Pass-2 on a fixed fixture) - estimator_coverage_is_deterministic - estimator_coverage_report (--nocapture prints the strict-K table) MEASURED strict-K (candidate_k=K=8): Pass-1 36.13% -> Pass-2-sign 46.39% -> estimator-cosine 49.71%. Still short of the ADR-084 90% strict bar; estimator reaches 95.12% at candidate_k=24 (vs sign 91.60%). Published negative. Co-Authored-By: claude-flow <ruv@ruv.net> * docs(ruvector): record RaBitQ estimator measured negative (ADR-156 §11, ADR-084) - sketch_bench: estimator cosine/euclid columns in the coverage table. - ADR-156 §11 (new): estimator formula + zero-centroid simplification stated honestly; strict-K coverage table; RESOLVED-NEGATIVE verdict (49.71% strict, short of 90%); pinning test names. §5 #2 + §10.5 updated. - ADR-084 'Pass 2b' (new): estimator landed + measured strict-K vs the bar. - CHANGELOG [Unreleased]: ADR-156 §11 Milestone-2 entry. Co-Authored-By: claude-flow <ruv@ruv.net>