Define the catalog/runtime/integration layering, per-org composite
view route, curated landing surface, breadcrumb positional contract,
reserved query-param real estate, and single-entry-point grant action
affordances. Adds 6 requirements to operator-panel-navigation; the
legacy ?tab= SPA contract stays until M7d retires it.
Also files an independent tech-debt item for member-console reading
products.product_type directly instead of the billing.product_kinds
view, per upstream membcons-db Doc 35 Product Kind Taxonomy.