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Perceptual-metrics Phase 4b, the last piece of the OKLCH editor. In OKLCH mode the picker's square becomes a Chroma (x) by Lightness (y) plane at the current hue. The crosshair maps to (C, L) and the hue strip selects H. The unreachable region is greyed out so the sRGB gamut boundary at that hue is visible, and the AA/AAA contrast mask overlays on top of the reachable colors.
The per-cell in-gamut test is forward-only: oklch to oklab to linear-rgb plus a channel-range check, never the binary search, which stays in oklch2hex for committing a chosen color. colormath.js now exports oklab2lrgb, inGamut, and lrgb2hex (with direct Node tests, including one that pins inGamut to oklch2hex's clamped flag so the plane and the commit path agree on the boundary). The rendered bitmap caches on hue, dimensions, mask, and background, so dragging C and L at a fixed hue reuses it.
HSV stays untouched: the square keeps its saturation/value gradient and the existing contrast mask. A #planetest headless guard asserts the crosshair lands at the color's (C, L), an out-of-gamut cell renders as the grey fill, and an in-gamut cell renders as a real color.
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Perceptual-metrics Phase 2. The picker now shows a second readout row under the WCAG ratio: the OKLCH coordinates (L, C, hue°) and the signed APCA Lc against the ground color. WCAG and all three contrast tables are untouched, so APCA stays picker-only for v1.
APCA Lc carries its sign convention in a tooltip and in the README: positive is dark text on a light background, negative is light text on a dark background, so a light color on dupre's dark ground reads negative.
pkReadout drives the new spans from the inlined colormath functions, and a #readouttest headless guard loads dupre-blue and asserts the spans match both the live computation and the known OKLCH reference, with WCAG unchanged.
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theme-coloring-guide.org is the design philosophy behind the tool, organized from principles out: seven laws, a role-to-treatment seed table, and three tiers (syntax, UI faces, org packages) as that table projected onto Emacs faces. It documents a shade budget per hue family, a functional signal-color convention table (not an emotion table), color-vision rules, and Emacs face specifics, and closes with canonical references. The README points to it, and dupre is the worked example.
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The tool authors themes from scratch -- palette, faces across every tier, live preview, export to a loadable deftheme. It never selects among existing themes, so "selector" mis-described it. Renamed the directory, the generated HTML and its title, the design spec, and every reference in the code, README, tests, and todo. No behavior change.
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