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ff058a4f10
Foundation only, no version bump -- nothing customer-visible changes yet. The
offer UI (Part 3), the degraded banner (Part 4) and the controller half of the
absent-target signal (Part 5) are NOT here; they are tracked as E-2 in
OPEN-ITEMS.md so this cannot become a sixth "seam built but never wired". The
fifth was found by E-2's own Phase 0: NotifyStorageDisconnected is defined and
called nowhere, so a drive going absent emits no event at all today.
StoragePath gains BackupTarget bool -- the sibling role to Schedulable/
IsDefault/Kind. It is INTENT, not truth: the authority is the agent's
backup.local_backup_target, and truth is read from GET /backup/tiers. This
records what the customer ASSIGNED so the controller can render the state,
notice the drive going absent, and detect drift.
Invariants, each pinned by a test asserting the CONSEQUENCE not the mechanism:
- a drive NEVER acquires the role by appearing (registration does not set it)
- exactly one carrier; assigning moves rather than duplicates
- sticky: a new bigger/faster drive does not steal an assigned target
- an absent target STAYS assigned -- clearing on disconnect would be a silent
retarget by omission ("no target configured" instead of "drive missing")
- a network share is refused (R-108 risk model; the role is about LOCAL disk
failure)
Red-proof C: adding auto-elevation to AddStoragePath fails
TestRegisteringDrivesNeverAssignsTheBackupTarget with
registering drives assigned the backup target "/mnt/hdd_1"
Attributes may suggest and refuse the absurd, never select: demo-felhom's backup
drive is an external USB HDD and BOTH demo boxes report removable=0, so a
transport rule disqualifies the reference drive and a removable rule finds no
candidate at all.
Green gate: build + vet + test rc=0, run separately from this commit.