IReadOnlyList<string> DependencyRefs compared by reference in the auto-generated record
equality, causing every VirtualTag with dependencies to be flagged "Changed" on every parse
(fresh list instances from composer and artifact-decoder). Add Equals/GetHashCode overrides
with element-wise ordinal comparison so Phase7Plan.IsEmpty short-circuits a no-op redeploy.
Add regression test Identical_virtualtag_snapshots_diff_to_empty_plan (separate list instances,
same contents → IsEmpty true). Add TODO comment in Phase7Applier near needsRebuild predicate.
Joseph Doherty
9818d0cba8