Stream and validate native feature loading with fast decoding and bounded SDK batches.
Reconcile authoritative department snapshots with rollback-safe metadata and file updates.
Bound downloads, isolate duplicate identifiers, and defer unchanged invalid photo versions.
Remove unused legacy face APIs and document device measurements.
Validation: 42 Flutter tests in an isolated source snapshot; native unit and device checks;
all 5,537 registered features verified byte-for-byte, plus real SDK photo searches and metadata checks.
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