From 16e31fe05da1885396dfdea0e5c55ed0e36e170c Mon Sep 17 00:00:00 2001
From: Brummel <mould@mycelium.de>
Date: Wed, 10 Jun 2026 18:55:24 +0200
Subject: [PATCH] =?UTF-8?q?audit:=20cycle=200028=20(#32)=20=E2=80=94=20dri?=
 =?UTF-8?q?ft-clean;=20param-sweep=20grid=20(the=20World,=20cycle=20C)?=
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Architect drift review over 776bd54..HEAD: drift-clean on every load-bearing
contract.
- C1: sweep()'s disjointness is real — sweep_with_threads shares only an
  AtomicUsize cursor, tags results by point index, sorts post-join; the family
  order is the enumeration order, thread-count-independent (pinned by
  family_is_deterministic_across_thread_counts at 1 vs 8 vs derived-N). Each
  point builds fresh, shares nothing mutable. First realization of "parallelism
  across sims, never within one".
- C16: zero-external-dependency intact — crates/aura-engine/Cargo.toml unchanged,
  no dependency added; execution is std::thread::scope, never rayon. No serde.
- C12: scope discipline held — only the C12.1 grid axis landed; random /
  optimize / walk-forward / MC and per-point manifest assembly are absent and
  deferred per spec.
- C19/C20: untouched — sweep drives bootstrap_with_params per point, no topology
  mutation.
- C14: the CLI's sweep_point_to_json mirrors RunReport::to_json's hand-rolled
  token rules byte-for-byte; no second JSON dialect. C8/C18: metrics-drain stays
  author-side in the closure (the engine ↔ harness boundary the design intends).

Regression: no scripts configured (profile regression: []) — architect is the
sole gate, and it is green.

Debt (filed, blocks nothing):
- #53 — the SMA-cross sample harness topology is now duplicated across three
  sites (blueprint.rs test, sweep.rs test, cli main.rs production) with no test
  pinning them equal. Pure tidy, carry-on.

Deferred follow-up filed:
- #52 — random param-sweep enumeration (C12.1's other half: ranges +
  sample-count + seeded RNG), the deliberate scope cut from this cycle's design.

Cycle 0028 closes #32 (param-sweep grid, engine primitive + aura sweep CLI
demonstrator). Milestone "parameter-space & sweep" is NOT closed by this audit
(that needs the milestone fieldtest, a separate manual act); #33 (run registry,
cycle D) remains open in the milestone.

closes #32