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Hero gate: text and chrome regions read as drift once structure and palette hold; scripts run through symlinks

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Three simulated builds under the previous gate reached 78-83% overall with
the exploded plate placed and the table right, then spent 12-20 attempts
chasing 'contradicted' verdicts on a headline set in a substitute face and
on 50px chrome strips whose detail was paper grain. Text with structure
above the floor and its palette intact is drift; chrome and controls with
structure and palette held are drift. The adversarial set (swapped
columns, mirror, sepia, noise plate, tile shuffle) still fails.

isMain uses realpath on both sides so a skill mounted through a symlink
(Cursor, worktrees, staged evals) still runs its CLIs.

AI-assisted (Claude).

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Paul Bakaus
2026-08-28 06:13:59 +05:00
committed by Abdul Wahab
co-authored by Claude
parent d9a155be8c
commit 24773eeedf
3 changed files with 31 additions and 4 deletions
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skill/scripts/comp-diff.mjs
+17 -1
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@@ -39,6 +39,7 @@
*/
import fs from 'node:fs';
import path from 'node:path';
import { fileURLToPath } from 'node:url';
import { decodePng, encodePng } from './lib/png.mjs';
import { crop, resize, fit, blit, createImage, fillRect, strokeRect, drawLabel } from './lib/raster.mjs';
import { structureScore, colorScore, detailScore, diffMap, horizontalBands, bandScore, dominantColors, toGray, blurGray, ssimShifted } from './lib/image-metrics.mjs';
@@ -139,6 +140,16 @@ export function verdictFor(s, kind = null) {
// the weighted mean says; painted regions with invented detail likewise.
if (s.structure < 0.3) return 'contradicted';
if (painted && (s.structure < 0.45 || s.detailAdded > 0.4)) return 'contradicted';
// Text is set in a substitute face at a slightly different metric almost
// always, and blurred SSIM reads glyph shape; a text region with its
// structure above the swap floor and its palette intact is drift at worst.
// Chasing it past that point is what burned eight to thirteen hero attempts
// per build in the first simulated round.
if (kind === 'text' && s.color >= 0.5) return s.overall >= 0.8 ? 'match' : 'drift';
// Chrome and controls are thin strips whose "detail" is mostly ground grain
// (a paper texture the build renders flatter, a scanline). When their
// structure and palette hold, low detail is drift, not contradiction.
if ((kind === 'chrome' || kind === 'control') && s.structure >= 0.5 && s.color >= 0.5) return s.overall >= 0.8 ? 'match' : 'drift';
if (s.overall >= 0.8) return 'match';
if (s.overall >= 0.6) return 'drift';
return 'contradicted';
@@ -333,5 +344,10 @@ async function main() {
}
}
const isMain = process.argv[1] && path.resolve(process.argv[1]) === path.resolve(new URL(import.meta.url).pathname);
// realpath on both sides: a skill mounted through a symlink (Cursor, a
// worktree, an eval stage) must still run as a CLI.
const isMain = (() => {
try { return !!process.argv[1] && fs.realpathSync(process.argv[1]) === fs.realpathSync(fileURLToPath(import.meta.url)); }
catch { return !!process.argv[1] && path.resolve(process.argv[1]) === path.resolve(new URL(import.meta.url).pathname); }
})();
if (isMain) main();