The app's biometrics probe is one-shot per island mount: when
isUserVerifyingPlatformAuthenticatorAvailable() resolves before the CDP
virtual authenticator answers, the enrollment form / biometric button
never mount and no wait flips them (prod-build CI flake). New
expectCampaignBiometricsReady(page) polls the platform answer BEFORE the
surface whose island probes it; adopted at both ceremony entries in
campaignWebAuthn (verified green locally). Conventions pin:
e2eNavigationConventions fails the build when a virtual-authenticator
spec skips the readiness gate.
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