The card never appeared: the Weather panel only passed five fixed ids and only
rendered lists and categorical legends for cyclones. Air quality now reaches
the panel, the legend style comes from the layer's descriptor, and any layer
with list items gets its list. Adds the voice manifest entry main now requires,
reads ECCC through the shared capped JSON reader with a 15 s deadline and the
row limit enforced, reports stale when every reading was too old, adds source
tests, links the ECCC licence and moves the changelog entry into Unreleased.
