Closes the two skipped null-preservation tests and the architectural
gap behind them. In CGA, null vectors represent Euclidean points;
under a conformal transformation a point must map to a point —
applying a versor sandwich to a null vector must preserve null
property. The previous implementation forced everything onto the
unit-versor shell, which is correct for field-state propagation but
wrong for geometric point input.
Implementation
- algebra/versor.py: new `_input_is_null(F)` checks `cga_inner(F,F) ≈ 0`;
`versor_apply` routes null inputs around `_close_applied_versor`
and returns the raw sandwich V·F·rev(V), which algebraically
preserves null property. Non-null inputs unchanged.
- core-rs/src/versor.rs: `versor_apply_closed_f64` gains the same
null-check branch via `input_is_null_f64`. ADR-0020 parity
preserved (8/8 versor_apply bit-identity tests still pass).
Test changes
- tests/test_architectural_invariants.py::TestINV06NullConePreservation::
test_versor_apply_preserves_null_property — un-skipped, passes.
- tests/test_rust_backend.py::test_rust_versor_apply_preserves_null_vectors
— un-skipped, passes.
- tests/test_versor_closure.py::test_versor_apply_closes_null_like_field_
results_for_runtime_contract — renamed to
test_versor_apply_preserves_null_property_for_null_inputs and
rewritten to assert the now-correct semantics (null in → null out).
The old contract over-specified closure for null inputs and
contradicted the architectural invariant; that's what kept the
invariant test skipped.
Stale gap docs updated
- inference_closure / cross_domain_transfer / multi_step_reasoning
gaps.md now lead with a resolution block: lanes pass at 100% on
both splits after the typed operators (transitive_walk,
multi_relation_walk, path_recall in generate/operators.py) +
pipeline wiring (_maybe_transitive_walk + _fold_walk_into_surface)
landed. The historic findings are preserved below for traceability.
- compositionality gaps.md: partial resolution — recall up from
6.25% to 68.75%; overall_pass True; residual ~30% miss requires
a relation-aware `compose_relations` operator (v2 follow-on).
Lane health unchanged: algebra 132, smoke 55, runtime 19, teaching 17,
packs 6, cognition 103. Cognition eval 100%. Four formerly-"blocked"
reasoning lanes confirmed 100% / overall_pass=True end-to-end.
Spreads the four remaining Phase 3 lanes to map the full reasoning-
depth surface alongside inference-closure (already landed at e509e0d).
Each lane is a v1 honest probe per the roadmap; engineering work
follows once the full surface is visible.
Results across all five Phase 3 lanes:
lane split primary signal foundation
inference-closure public/v1 0.0 1.0 / 1.0
inference-closure holdouts/v1 0.0 1.0 / 1.0
compositionality public/v1 0.0625 (1/16) 1.0 / 1.0
compositionality holdouts/v1 0.0 1.0 / 1.0
multi-step-reasoning public/v1 0.0 1.0 / 1.0
multi-step-reasoning holdouts/v1 0.0 1.0 / 1.0
introspection public/v1 0.0 (no api) n/a
introspection holdouts/v1 0.0 n/a
cross-domain-transfer public/v1 0.0 1.0 / 1.0
cross-domain-transfer holdouts/v1 0.0 1.0 / 1.0
Foundation guarantees (storage + replay) intact across every lane
that has them. The reasoning-depth signal is uniformly zero. The
five lanes triangulate four architectural gaps:
Gap 1. generate/graph_planner.py has no transitive composition.
Gap 2. field/propagate.py has no derivable-but-not-asserted recall.
Gap 3. core/cognition/explain.py module does not exist.
Gap 4. no structural-pattern recogniser (cross-subdomain transfer).
Gaps 1, 2, 4 cluster on the same code surface and may close together
as a single bounded PR. Gap 3 is independent module-creation work.
Lane scaffolding mirrors inference-closure (contract.md, runner.py,
dev + public/v1 + holdouts/v1 cases.jsonl, baselines/v1_structural_zero.json,
gaps.md). All runners are parallel-safe and use the standard
run_lane(cases, *, config, workers) interface.
Per-lane gaps.md records the engineering shape for v2 plus future
directions worth not forgetting:
- compositionality/gaps.md: metaphor is compositionality with
selective property transfer; building it is correctly downstream
of closing this lane.
- cross-domain-transfer/gaps.md: metaphor + narrative as
cross-domain operators; narrative requires the Agency open-scope
decision to pin first.
- introspection/gaps.md: explain API is also the substrate for
first-person narrative self-account.
Recommended v2 sequence in docs/PROGRESS.md:
1. Pin Agency + Tool-use open-scope decisions (deadline: before
Phase 3 engineering).
2. Engineer Gaps 1 + 2 as one bounded PR.
3. Engineer Gap 3 independently.
4. Re-author cross-domain-transfer v2 with matched-control
contract refinement.
Phase 3 v1 exit: 0/5 lanes passing, which is the expected v1 floor.
CLI suites smoke / cognition / teaching pass; no regression on
Phase 2.
Shay