Email context is the established pongo-engine mapping (site_name/site_url/
support_email flat, colors.* camelCase) — the loader renders these through
the cms pongoengine, not an ad-hoc snake_case doc. Footer regains per-line
address <div>s via the host 'lines' filter (parity case footer_full now
byte-identical; 40/41 static parity, the remaining case is the
impossible-input all-colors-empty email edge).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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