Returns the tenant's CURRENT effective Edition view — the deployment edition, the per-tenant override (null when the tenant inherits), the effective edition, and the backend token plus routing source resolved by the same precedence the S2S resolve seam applies. Mutates nothing. Unlike the assign, this read is available on EVERY deployment type, so a converted environment can still see the override it needs to clear. Required scope: admin.platform.tenant.edition.assign.