First per-layer audit of the substrate-liveness program. Establishes the
registry shape and standard of evidence for subsequent layers.
L0 (algebra primitives) is foundation; verdict CLOSED:
- 4 ADRs in scope (ADR-0001 versor invariant, ADR-0003 coordinate
dissolution, ADR-0004 rotor as operator, ADR-0009 compositional
physics).
- 6 modules (versor, rotor, cga, cl41, holonomy, backend); every
module has at least 2 live-import sites outside the package and
outside tests (38 distinct caller files overall).
- core test --suite algebra exercises every L0 module: 82 passed, 50
skipped (Rust-parity tests, Python-only env — not a closure gap).
- Cross-layer contract pass 1 (mechanical): every exposed symbol has
at least one downstream consumer.
- Cross-layer contract pass 2 (semantic): versor_condition < 1e-6
invariant is measured per turn (core/cognition/trace.py:34), folded
into deterministic trace payload, surfaced to operator via CLI, and
gated at the eval boundary (evals/cognition/runner.py:60). Matches
CLAUDE.md discipline of "measure and surface, don't weaken."
No cleanup performed — no dead code, no redundant modules, no
orphaned tests found at L0. Foundation is honest.
One scope-hypothesis correction: layering table cited "algebra/backend/"
(directory); reality is "algebra/backend.py" (file). Hypothesis drift,
recorded for amendment if it matters elsewhere.
Three forward-pointing notes left for downstream auditors:
- L1 should verify field propagation correctness is tested
independently of L5's downstream versor_condition measurement.
- L2 should verify vault honors exact-CGA-recall end-to-end, not just
at the algebra layer.
- ADR-0020 (Rust parity) is cross-cutting; audit when Rust integration
is live rather than at any single layer.
Format established for subsequent per-layer commits. Audit progress
table in registry root tracks pending layers; resume-after-interruption
is "look at the progress table, start with the first pending layer."
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