Zone 1 becomes the default dive site; the foundation suite still selects the calibration site explicitly. Documents the site suites, the site content workflow and the authored heightfield terrain (ADR 0012), and aligns the zone 1 brief with the baked data (storage format, route lengths, 6 m ridge and pinnacles). Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>