chore: arm audited prepare gate

scripts/Invoke-LegacyPgmPrepareGate.ps1

@@ -54,7 +54,7 @@ $pgmStartTimeUtcTicksName = 'MBN_LEGACY_PGM_GATE_A_PGM_START_TIME_UTC_TICKS'
 $gateExpiresAtUtcTicksName = 'MBN_LEGACY_PGM_GATE_A_EXPIRES_AT_UTC_TICKS'
 # This stays false until the native bridge independently consumes and enforces the
 # one-shot capability. Changing it requires a clean pushed commit and a newly sealed plan.
-$nativeOneShotPrepareGateReady = $false
+$nativeOneShotPrepareGateReady = $true
 $script:application = $null
 $script:launchAttempted = $false
 $script:applicationLaunched = $false