Add a breadcrumb-ld partial (rendered from breadcrumbName/breadcrumbParent
front-matter) emitting BreadcrumbList JSON-LD on all 11 interior pages
(3-level on the job pages). Enrich homepage LocalBusiness with geo,
areaServed (US), and hasMap. NOTE: geo coords are approximate (Ronkonkoma
ZIP) — set precisely from the Google Business Profile; openingHours and
sameAs omitted pending real hours + non-placeholder social URLs.
