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Step 4 of milestone 309. All 40 combinations measured rather than eyeballed — 10 hues x 2 themes x 2 weights, dark ones composited over the board the way Compose and CSS both do, against the text actually drawn on a card (neutral-700/300 body, neutral-500/400 meta). Body text ranges 8.23:1 to 13.01:1 against a 4.5:1 requirement; meta text 4.33 to 7.11 against 3.0. Every combination passes AA with room to spare, so the two ramps step 3 introduced need no adjustment. That is the boring half. THE PASS FOUND A REAL REGRESSION. A tagged note takes its first tag's colour and is drawn at that hue's `-100` — which is exactly what the chip uses as its fill. Measured contrast between the chip and the card it had itself coloured: 1.00 in light mode. Perfectly invisible. Dark was 1.04-1.07, invisible in practice. On every tagged note the tag name had stopped reading as a chip and become loose text, and nothing about step 3 looked wrong while writing it. Fixed with an EDGE rather than a different fill. A fill can collide with any card colour and chasing that would need the chip to know what it is sitting on; a border in the chip's own foreground reads against any background and needs no plumbing. Alpha is 0.60, measured: 2.32:1 at worst, where the 0.30 I first wrote gave 1.49 and was no edge at all. It does not reach WCAG 1.4.11's 3:1, which needs 0.80 and draws a hard outline instead of a hairline. 1.4.11 governs boundaries carrying REQUIRED information, and a chip's information is its text — passing AA at 8:1 or better on every card here. The number and the reasoning are both in the source so the judgment can be overruled rather than rediscovered. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>