Additive enrichment to MeResource — existing fields untouched, MeTest stays green.
New fields:
- contexts.available: list<'portal'|'organizer'> derived from Person + Organisation memberships
- contexts.default: precedence super_admin > organizer > portal > fallback portal
- platform.is_super_admin: bool promoted from app_roles
- organisations[].roles: 1-element array form alongside the legacy scalar role,
forward-compatible for the multi-role pivot work tracked in TECH-PIVOT-ROLES-MULTI
UserFactory gains volunteer(), orgAdmin(), volunteerAndOrganizer(), superAdmin()
state methods — codified role categories for reuse across future workstreams.
Adds forbidden.vue placeholder (PublicLayout) for the context-failure landing in
the upcoming guard rewrite.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>