The third describe block (`ensurePeered needs_attention handling`) was
the last federation test still using the legacy `vi.doMock` +
hand-crafted drizzle query-chain pattern. Convert it to the converged
in-memory better-sqlite3 + real drizzle pattern used by every other
federationPeering.* test (exemplar:
federationPeering.approvalToken.test.ts).
The first two describe blocks (`EnsurePeeredResult type`, `racePeering`)
did not use vi.doMock and remain byte-identical. The needs_attention
test's behavior is preserved 1:1: same `it(...)` description, same
assertions (status === 'rejected', error contains 'needs_attention',
fetch never called).
Module-level `vi.mock` calls now apply to the whole file, but the
type-only and racePeering tests don't exercise the mocked modules, so
there is no behavioral interaction.
No production code changes. No new test scenarios. No skipped/only/
commented blocks. All 352 server tests pass.