audit: #319 cycle close — architect drift resolved, bench green

Architect review over 9cfe296..dc5f174 (drift_found -> all five items
fixed in this close): C24's family-machinery sentence re-amended to
current truth (synthetic walks are reproduce-only inputs since the
builder retirement; superseded text to the sidecar); the ported
generalize test's doc no longer promises the retired CrossInstrument
family handle and its stale section header is gone;
FamilyKind::CrossInstrument carries its C18 dead-machinery/read-back
note in code; live comments in campaign_run, bench surfaces, and
graph_construct name exec instead of the retired verbs; the five
inlined topology_hash copies in the bin test module consolidated into
one test helper. What holds, per the architect: C24<->code gated-intake
lockstep exact, C12's single-hash claim true in code, exec dispatch
matches C14's amended text.

Bench (regression gate) exit 0, all five fingerprints OK:
engine_throughput bars_per_s 14014049 (+0.1%), ingest_throughput
12935441 (-0.5%), campaign_sweep wall 1.407s (+0.9%), campaign_heavy
wall 5.688s (+2.1%), cli_fixed_cost run_ms 3.6 (+6.6%, spawn-floor
jitter under parallel-agent load, report-only). No baseline moved.
Also rides: the reviewer re-check's two comment nits (classify-once
wording, SIGPIPE example verb).

refs #319

docs/design/contracts/c24-blueprint-data.history.md

@@ -235,3 +235,14 @@ prepend bare `aura: `. Store read-back (`reproduce`, `use` resolution,
 registered artifact is never retroactively invalidated."
 
 **[C26, 2026-07-10 (#231): the single-price data weld inside the surviving `wrap_r` scaffolding is retired — input roles bind archive columns by name; the wrapper's remaining R-scaffolding retirement stays #159.]** (From the C24 Forbids clause as of that date; the single-price weld was retired at #231/C26, but `wrap_r` itself survives — its full R-scaffolding retirement stays deferred, #159.)
+
+---
+
+> The disjoint-parallel synthetic
+> price walks a sweep/MC family draws (`aura_runner::family`) are the family
+> machinery, not trader-grade statistics; a real-data block-bootstrap — and
+> retiring the `synthetic_walk_sources` `len:60`↔warm-up coupling — rides #172.
+
+(superseded by the #319 sugar retirement, 2026-07-25 — audit-close correction:
+no family-minting path draws synthetic walks after the family-builder
+retirement; only `reproduce` consumes them)

docs/design/contracts/c24-blueprint-data.md

@@ -98,10 +98,13 @@ a collision with a document-declared axis).
 Every member manifest carries the **shared** `topology_hash` (one signal
 topology, only params vary; `member_key` distinguishes members), and the
 executor stores its blueprint(s) content-addressed so `aura reproduce`
-re-derives every member bit-identically (C18). The disjoint-parallel synthetic
-price walks a sweep/MC family draws (`aura_runner::family`) are the family
-machinery, not trader-grade statistics; a real-data block-bootstrap — and
-retiring the `synthetic_walk_sources` `len:60`↔warm-up coupling — rides #172.
+re-derives every member bit-identically (C18). The synthetic price walks
+(`aura_runner::family::synthetic_walk_sources`) survive the #319 retirement
+only as `reproduce`'s re-derivation inputs for historically minted synthetic
+families — no family-minting path draws them anymore (the campaign executor
+is the one family builder, C20) — and they are not trader-grade statistics; a
+real-data block-bootstrap — and retiring the `len:60`↔warm-up coupling —
+rides #172.
 
 ### Reproduction identity