[pbroom]

• ContrastRegionLayer scores candidate fill paths with core's
  contrastRatio / contrastAPCA, passing the region's gamut, instead of
  its own unclamped WCAG copy and gamut-less APCA call, so the score
  matches the field the contrast region was traced from.
• Export linearToSrgbChannel / srgbToLinearChannel from core and use
  them in ColorPlane's CPU path instead of a local transfer-function
  copy (GLSL shader sources keep their own implementation).
• createWebglState now deletes the shaders, program, and buffer it
  created when compilation, linking, or uniform lookup fails.

Part of a stacked set of PRs (#204 → #221) from the color-kit assessment. Validated per branch with pnpm build and pnpm test; lint, format, typecheck, size, artifact, preprod and agents checks pass at the top of the stack.

🤖 Generated with Claude Code

[pbroom]

• refactor(react)!: remove UI components; ship state and plane hooks only #249
• docs(react): rebuild the React docs around the plane hooks #248
• feat(react): add plane renderer, geometry and adaptive-quality hooks #247
• feat(docs): syntax highlighting palette for code samples #246
• feat(docs): native API map at /api/map #245
• docs: add concept pages, guides and entry-point narratives #244
• feat(docs): live plane hero on home and the example system #243
• feat(docs): generated API reference from TypeDoc JSON #242
• refactor(core)!: derive plane query budgets from step counts and drop PlaneWithSense #241
• fix(react): render input aria-label once, on the inner input #240
• fix(driver): map absolute percents as range positions and keep tiny-step precision #239
• fix(core): uncap saturate chroma and resolve planeHue as an OKLCH hue #238
• fix(driver): reject unknown gamuts and align validation error types #237
• chore(docs): remove Sandpack, the shadcn kit and the legacy docs shell #236
• docs(core,driver,react): document the public API #235
• chore: pin control-kit to a commit with its own pnpm workspace #234
• docs: update implementation backlog for the contrast solver replacement #232
• refactor(react)!: remove ColorPlane's deprecated edge option and webgl renderer alias #231
• fix(driver): validate the gamut in getColorAreaFallbackPoint #230
• feat(driver,react): keep the previous hue when an achromatic color is entered #229
• refactor(core)!: replace the hybrid contrast solver with chroma-column tracing #228
• perf(core): trim what contrastRatio pulls in #227
• perf(core): pack the named-color table #226
• feat(core): point 'p3' users to 'display-p3' #225
• chore: ignore local .claude files in prettier #224
• refactor(core)!: retire the legacy contrast-region engine #223
• fix(core): keep hybrid contrast contours connected through folds #222
• chore: add changesets for the assessment stack #221
• docs: generated API reference and repo polish #220
• chore: adopt changesets for versioning and release notes #219
• chore: fix facade peers, licensing, and lint ignores #218
• refactor(react): reuse core contrast and transfer functions #217 👈 (View in Graphite)
• refactor(core)!: make the contrast-region engine explicit #216
• refactor(core)!: remove pre-launch aliases and trim the root export surface #215
• refactor!: name the Display P3 space 'display-p3' everywhere #214
• refactor(driver): share pointer drag throttling between slider and area #213
• feat(react): keyboard, ARIA, disabled, and focus support for sliders and areas #212
• fix(react): stable refs, WebGL context loss, and handler composition #211
• fix(react): apply controlled updates against the latest snapshot #210
• feat(core): selectable gamut mapping method #209
• fix(core): compute contrast from unrounded values #208
• fix(core): consistent achromatic hue handling and single transfer function #207
• feat(core): parse CSS Color 4 syntax #206
• fix(core): reject malformed color input instead of producing NaN #205
• chore: add fast-check and axe-core test dependencies #204
• docs: graphics and performance APIs demo page #203
• feat(core): tuple and typed-array interop for GPU and three.js #202
• feat(core): allocation-free *Into variants for hot paths #201
• feat(core): interpolation space option for mix/interpolate/generateScale #200
• main

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[greptile-apps]

Confidence Score: 4/5

[Medium risk] Moves color math functions to shared core library.

The PR appears safe to merge; the remaining findings are non-blocking gaps in targeted regression coverage.

Findings

1.  Gamut-aware fill scoring lacks tests ▶
2.  Cleanup failure branches remain untested ▶

Summary

This PR makes React contrast-fill scoring use core’s gamut-aware metrics, replaces the CPU plane’s local channel transfer with core’s exported function, and releases WebGL objects when setup fails.

• The inspected metric and transfer paths align with their corresponding core and shader behavior.
• Targeted fill and additional WebGL failure-branch tests remain worthwhile.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  A[Core contrast region] --> B[Region paths]
  B --> C[React fill candidates]
  D[Core contrast metrics and gamut] --> C
  E[Core channel transfer] --> F[CPU color plane]
  G[WebGL setup] -->|success| H[GPU color plane]
  G -->|failure: release resources| F

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Project	Deployment	Actions	Updated
color-kit	Ready	Preview	Oct 10, 2026 7:24pm UTC

[pbroom]

Merge activity

• Oct 10, 6:47 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Oct 10, 7:24 PM UTC: Graphite rebased this pull request as part of a merge.
• Oct 10, 7:24 PM UTC: @pbroom merged this pull request with Graphite.