Adds the subsystem contract deltas and verification artifacts for the
preceding wearout and physical-disk-node fixes, which landed without them.
The contracts now state the rule rather than leaving it implicit in each
caller. Wearout has two absent states and one real zero, -1 is the unreported
sentinel, and 0 is evidence only from a device that reports endurance at all.
storagehealth.WearoutReported is the single authority, and alerting, the
unified risk projection, and the frontend all gate on it. Storage-recovery
records that disk-to-node association is evidence-directional, so a disk with
no Proxmox scope still matches on node name while a scoped disk stays inside
its instance.
Proofs cover the predicate itself, a spent SSD alerting where it previously
stayed silent, absent evidence staying quiet on both the unreported sentinel
and a rotational zero, the view returning the sentinel rather than the struct
zero value, and the presentation helpers agreeing with the server.
Verified: full frontend suite 1061 files / 19405 tests, canonical completion
guard, gofmt, go build ./..., and internal/alerts, internal/monitoring,
internal/storagehealth, internal/unifiedresources.
rcourtman
d82d3bd627