feat(canopy-seed): multi-determination per CAPS household

Source: canopy-seed-caps-wic-fixtures plan Potential Improvements.

CAPS seeder currently emits one determination per household. Real CAPS cases routinely have multiple children with separate authorizations under the same household. Seeder should split per-child to better mirror real caseloads and exercise the multi-record code paths in canopy-caps + canopy-web.

Acceptance: phase11_caps_determinations supports households with N>1 children, each producing its own determination row. Playwright authorization tab assertions extended to verify multi-row rendering.