BFX05-01: Verify that Tenants can be notified, by some communication system, of planned future node maintenance

[jkenyon-nvidia]

Requirement: BFX05

Verify that Tenants can be notified, by some communication system, of planned future node maintenance

Source: software-reference-requirements (NSRG), not offtake.
Plan status: approved / published_version pending.
Legacy ID: BFX-XX-02.
Action: Implement net-new validation stubs (suite wiring + my-isv template + constraints) so a third party can fork and implement for their system.