Give every palette colour a hex value an engine without oklch can read

docs/reading-cost.md

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+# Reading cost
+
+## Reading cost, chunk 57e864bce02a, finished 2026-10-30T23:59:00Z
+
+100624 new input tokens before the first commit.
+
+Read most (opens and searches):
+
+- `src/http/app.test.ts` 9
+- `README.md` 7
+- `src/http/app.ts` 4
+- `todo.md` 3
+- `e2e-tests/playwright.config.ts` 2
+- `AGENTS.md` 1
+- `CHANGELOG.md` 1
+- `ci.sh` 1
+- `examples/plugins/scheduling/views/shifts.ejs` 1
+- `src/auth/csrf.ts` 1