From 3a1dceb83a0d8a677f771f19c3e30f281bafa2b6 Mon Sep 17 00:00:00 2001
From: Brummel <mould@mycelium.de>
Date: Sun, 14 Jun 2026 00:20:23 +0200
Subject: [PATCH] =?UTF-8?q?audit:=20cycle=200038=20=E2=80=94=20drift-clean?=
 =?UTF-8?q?=20(shared=20SMA-cross=20test=20fixtures)?=
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Close-audit for cycle 0038 (commit range c939673..1f01bad). Architect drift review
against the design ledger + CLAUDE.md domain invariants: no contract drift, no debt.
No regression scripts are configured (the architect is the gate); build + test +
clippy verified green independently by the orchestrator (aura-engine 114 passed,
count unchanged; the two load-bearing consumers green; clippy --all-targets
-D warnings exit 0).

cycle 0038 (clean):
- C16 preserved: the new shared fixtures live in a #[cfg(test)] mod test_fixtures,
  which compiles into no shipped artifact — the engine still ships no sample.
- C1 / C11 / C12 strengthened, not weakened: the determinism witness
  (composite_sma_cross_runs_bit_identical_to_hand_wired) and the sweep-equivalence
  witness (sweep_equals_n_independent_runs) now consume one shared fixture instead
  of two hand-kept copies, so the harness topology can no longer silently diverge
  between the two test modules — the exact hazard #53 named.
- Test-organisation convention held: a crate-root #[cfg(test)] module of pub(crate)
  free fns, sibling to the existing reexport_tests precedent, declared in lib.rs.
- graph_model.rs's minimal golden copy (sma_cross / sample_root) was correctly left
  independent and out of scope, by design.
- Stale-cross-ref sweep clean: docs/design/INDEX.md and docs/glossary.md name no
  fixture site that the move invalidated; the fixture-name hits in docs/ are
  historical specs/plans pinned to their own cycles, not live contracts.

In-flight plan correction (recorded for history): the plan's literal import list
over-imported sma_cross, which neither consumer calls directly (reached only
transitively via composite_sma_cross_harness); the implementer trimmed it to satisfy
the plan's own clippy -D warnings gate — within the task's import-cleanup scope.