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* refactor(train): hoist canonical PCK/OKS to un-gated metrics_core; fold test_metrics onto production (ADR-155 M1 §8) ADR-155 §8 deferred item: test_metrics.rs reference kernels validated production against their OWN reimplementation — a test that cannot catch a canonical-impl bug (both could be wrong the same way). - Extract canonical_torso_size / pck_canonical / oks_canonical / sigmas / bounding_box_diagonal into a new NON-tch-gated `metrics_core` module, so the single metric definition is reachable under `cargo test --no-default-features` (the `metrics` module is tch-gated). `metrics` re-exports every item → still exactly ONE implementation. - Rewrite tests/test_metrics.rs to assert the PRODUCTION pck_canonical / oks_canonical equal hand-computed fixtures (not a reimplementation): canonical_pck_matches_hand_computed_fixture (corr=3/total=4/pck=0.75), hip↔hip normalizer pin, zero-visible⇒0.0, OKS perfect⇒1.0, fake-Gold pin. - Keep an INDEPENDENT raw-threshold reference kernel only as a differential cross-check: test_kernel_agrees_with_canonical asserts it AGREES with canonical where torso==1.0 (genuine cross-check, not duplication). Grade: MEASURED. test_metrics 10→12 tests, 0 failed. Co-Authored-By: claude-flow <ruv@ruv.net> * fix(sensing-server): relabel divergent live PCK/OKS so they're never conflated with canonical (ADR-155 M1 §2.1/§8 Goal C) Goal C named training_api.rs:804 (torso-HEIGHT PCK). Auditing it surfaced TWO findings the ADR-155 §1 table missed: 1. training_api.rs is an ORPHAN file — not declared `mod` in lib.rs OR main.rs, so it does NOT compile into the crate. It does not drive the live server. 2. The REAL live `best_pck`/`best_oks` (main.rs training path → RVF metadata JSON read by model_manager.rs) come from trainer.rs: - `pck_at_threshold` = RAW-threshold PCK, NO torso normalization (the most divergent kind), printed/serialized as bare "PCK@0.2". - `oks_map` calls `oks_single(area=1.0)` = the EXACT fake-Gold pattern ADR-155 §2.1 claimed closed elsewhere — still live here, inflating best_oks. Resolution = RELABEL (torso/raw math is load-bearing on different data; the pub fns can't be renamed without breaking API; sensing-server has no train/ ndarray dep). Honest unify is a tracked §8 backlog item. - training_api.rs: `compute_pck` → `compute_pck_torso_height` + divergence doc; val_pck/best_pck/val_oks struct fields documented as torso-HEIGHT proxies; logs say `pck_torso_h@0.2`. Test torso_pck_is_labelled_distinctly_from_canonical. - trainer.rs (LIVE): `pck_at_threshold` documented raw-unnormalized; `oks_map` area=1.0 flagged fake-Gold; test pck_at_threshold_is_raw_unnormalized_not_canonical. - main.rs: live print relabelled `pck_raw@0.2` / `oks_map(area=1.0 proxy)`. No wire-format field renames (back-compat); no pub-API rename (no silent break). Grade: MEASURED (relabel + divergence pinned). sensing-server 450→451 lib tests, 0 failed. Co-Authored-By: claude-flow <ruv@ruv.net> * docs(adr-155): mark §8 metric items RESOLVED + audit map + honest §1 under-count correction (M1b Goals A/D) - §8.1: full PCK/OKS audit map (every def: file:line, basis, canonical/ legacy/distinct), the two §8 items marked RESOLVED with resolution+why. - Honest finding: §1's "seven divergent metrics" was an UNDER-count — sensing-server's LIVE trainer.rs has a raw-unnormalized PCK and an area=1.0 fake-Gold OKS the table omitted, and the file §8 named (training_api.rs) is orphaned dead code. §9 honest-limits updated. - Goal D: metrics.rs *_v2 variants confirmed caller-less + deprecated; noted for future cleanup, NOT deleted (public API, tch-gated). - CHANGELOG [Unreleased] Fixed entry. Co-Authored-By: claude-flow <ruv@ruv.net> * feat(ruvector): RaBitQ Pass-2 randomized rotation + topk bugfix (ADR-156 §8) Implements the deferred "Multi-bit / Extended RaBitQ Pass 2" backlog item from ADR-156 §8: a deterministic randomized orthogonal rotation applied before sign-quantization, the published RaBitQ construction (Gao & Long, SIGMOD 2024). Rotation construction: Fast Hadamard Transform + seeded ±1 sign flips ("HD" / randomized Hadamard), O(d log d) time and O(d) memory — a dense d×d rotation is O(d²) and infeasible at the 65,535-d the wire format provisions for. Pads to the next power of two; SplitMix64 seeds the sign stream so index-time and query-time rotations are bit-identical. API is additive and backward-compatible: Pass 1 (`from_embedding`) is untouched; Pass 2 is opt-in via `Sketch::from_embedding_rotated` and `SketchBank::with_rotation` (+ `insert_embedding` / `topk_embedding` / `novelty_embedding` helpers that rotate consistently). Default behaviour is unchanged. While building the Pass-2 coverage harness, found and fixed a PRE-EXISTING correctness bug in `SketchBank::topk`: the n>k heap path used `BinaryHeap<Reverse<(d,id)>>` (a min-heap) but treated its peek as the max, so it returned the k FARTHEST sketches as "nearest". The shipped unit tests only exercised the n≤k fast path, so it went unnoticed. Fixed to a plain max-heap; pinned by `topk_heap_path_returns_nearest` and `tight_clusters_give_high_coverage_with_overfetch` (the latter measured 0.072 on the old code). New tests (+17, 100→117 in the crate): rotation determinism/norm-preservation (`rotation_is_deterministic_for_seed`, `rotation_preserves_norm`), Pass-2 shape-compatibility, `pass2_coverage_not_worse_than_pass1`, and a deterministic coverage report. MEASURED top-K coverage (anisotropic planted-cluster fixture, cosine ground truth; dim=128 N=2048 K=8 64 clusters noise=0.35 128 queries): candidate_k=K=8 : Pass1 36.13% -> Pass2 46.39% (both << 90% bar) candidate_k=24 : Pass1 83.89% -> Pass2 91.60% (Pass2 clears 90%) candidate_k=32 : Pass1/Pass2 100% Honest result: rotation consistently helps (+10pp at strict K), but neither pass clears the ADR-084 90% bar at candidate_k==K on this distribution. Pass 2 reaches 90% only with ~3x over-fetch (the ADR-084 "candidate set" deployment pattern). Multi-bit Pass 3 evaluated separately. Co-Authored-By: claude-flow <ruv@ruv.net> * feat(ruvector): multi-bit Pass-3 experiment + ADR-156/084 measured results Adds the multi-bit half of the ADR-156 §8 "Multi-bit / Extended RaBitQ" item as a MEASURED experiment (coverage::measure_multibit): rotate, then b-bit uniform scalar-quantize each coord, rank by L1 over codes — the natural multi-bit generalization of hamming. Measures the bit/coverage tradeoff the backlog item asked for. MEASURED at the strict bar (candidate_k=K=8, anisotropic planted-cluster fixture, cosine ground truth): Pass1 (1-bit, no rot) 36.13% 16 B/vec Pass2 (1-bit, rot) 46.39% 16 B/vec Pass3 (rot, 2-bit) 54.39% 32 B/vec Pass3 (rot, 3-bit) 66.70% 48 B/vec Pass3 (rot, 4-bit) 74.22% 64 B/vec Honest: multi-bit monotonically helps but even 4-bit (4x memory) reaches only 74% at the strict bar — neither rotation nor <=4-bit multi-bit clears the strict-K 90% bar on this distribution. The bar is met via over-fetch (Pass2 @ candidate_k=24). Tests: multibit_tradeoff_report, multibit_1bit_matches_pass2_approx (+ sanity that 1-bit ~= Pass-2). Docs: - ADR-156 §8 item #2 marked RESOLVED-PARTIAL; §5 #2 grade CLAIMED -> MEASURED-on-our-hardware; new §10 with full measured tables, the topk bugfix disclosure, and graded deferred sub-items. - ADR-084: "Pass 2" section answering the rotation open-question with measured numbers + the topk bug note. - CHANGELOG [Unreleased]: Added (Pass-2 milestone) + Fixed (topk heap). Co-Authored-By: claude-flow <ruv@ruv.net>