The three `--hermes-diag-*` tokens were literals declared on the consuming
elements, so the theme engine's `<html>`-level custom properties could never
reach them and light presets rendered the warning badge at 1.8:1 contrast.
Chain them through the host tokens themes already set (`--color-warning`,
`--color-destructive`) with the shipped literals as fallbacks; same selector
list, so nodes rendered outside `.hermes-kanban` keep a value. Error and
critical share `--color-destructive` (critical keeps its bold weight).
Co-authored-by: liuhao1024 <sunsky.lau@gmail.com>
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