PR #2990 root cause: the resolver SQL added `name` to the SELECT for
DisplayName plumbing, but the e2e test's sqlmock fixture
(expectChainQueryRoot at swap_test.go:216) still scripts the
3-column shape. Three e2e tests fail with:
sql: expected 3 destination arguments in Scan, not 4
Fix: bump the fixture to 4 columns (id, name, parent_id, depth) and
pass an empty name. The e2e tests don't assert on label rendering —
they pin the namespace string flow ("workspace:root-1" etc), which
is unchanged. Empty name is fine: ReadableNamespaces still emits the
correct namespace strings; only DisplayName is empty.
Caught by CI's Platform (Go) check on PR #2990 — would have been a
silent missed-coverage case in the resolver_test.go run because that
package doesn't import the e2e package.
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