chore(scripts): the swallow-family census copies persistGrantNameBackfillRecord from the gate vocabulary

The census keeps a deliberate copy of the durability gate's critical
callees and its gated self-test reds when the two drift; the gate gained
the grant-name backfill's ledger write, so the copy does too.

Claude-Session: https://claude.ai/code/session_01WkL6Eijt432S1Y7ekb6ovQ
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

scripts/measure-durability-swallow-family.mjs

@@ -329,6 +329,7 @@ const WRITE_SHAPED_CALLEES = new Map([
   ['persistPackageCommitRow', 'gate-vocabulary'],
   ['persistSeedTenancyReceiptRow', 'gate-vocabulary'],
   ['persistLedgerDecisionRow', 'gate-vocabulary'],
+  ['persistGrantNameBackfillRecord', 'gate-vocabulary'],
   ['recordLog', 'gate-vocabulary'],
   ['runWideningAlters', 'gate-vocabulary'],
   ['applyConfigPatch', 'gate-vocabulary'],