Hoshe found the concrete residual: the hand-copied driver block called
derive_temperature_c unconditionally where invent_primitives prefers the
lapse-adjusted region baseline on non-airless bodies — driver_temp feeds
glaciation/moisture into the warp magnitude, so orbital displacement
could still differ from District at the same position (the ticket's
defect class, one step upstream); the copy structurally couldn't branch
right because region_baseline_at_district was computed after it. Tyre
demanded the structural cure: steps 1-3 now live in ONE shared helper
(invent_coastal_position -> warped position + CoastCharacter);
invent_primitives composes helper + detail-scatter; the orbital path
hoists the baseline and makes a single helper call. The audit test's own
'District-style' side turned out to be a THIRD copy carrying the same
bug — rewired to the real helper (raw pre-fix side untouched as the
historical baseline; refreshed: 5.01% disagreement, mean 5,957.9 m,
748.9 ns/cell). Golden verified byte-identical under forced regen, with
the reason traced: the wire temperature never flowed through the buggy
internal branch, and the fixture's probe positions cross no discrete
boundary — the 267-body audit is the instrument that sees the drift.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
jpmschweitzerandClaude Fable 5
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