All three were debts taken on knowingly, with the reason recorded at the
time. Writing them down so that picking one up does not mean reconstructing
why it exists — each gets the measurement that justifies it, a concrete
approach naming the actual files and lines, the existing gate that says when
it is done, and the wrong fix it must not reach for.
1. Four scenes (Classic Wave, Silk Ribbon, Kaleido Tunnel, Slow Orb) declare
the style trait and honour it with `col += sigGrain(uv)` and nothing else,
so they cannot decline the track's grain the way other scenes now can.
Each already has an edge-weight or softness knob to route u_sigLine and
u_sigSoft into. Parked at texture: 0.35, which keeps grain on the
library's cleanest scenes purely to keep a gate green.
2. Curl Flow, Signal Decay and Circuit Bloom have no parameter that changes
their structure — 1.31x, 1.21x and 1.10x against a 1.25x bar. They are
statistically identical everywhere and at all times, which is what "it
looks the same for five minutes" means technically. Needs structure, not
motion; they already move too much.
3. Horizon Lines reports a 2/255 determinism delta when phase 7 runs alone
and passes in a full run. Invisible as an image, but a gate whose verdict
depends on preceding GPU load will eventually stay green through a real
regression on the one property this whole project is built on. Prime
suspects are named: 40 accumulated line terms, and a smoothstep edge as
thin as 0.002 evaluated on a cancelling subtraction.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
