Replace AgeKeySource/resolve_age_key/install_age_key with IdentitySource/resolve_identities. Update integration tests to use a valid age bech32 key fixture. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Replace AgeKeySource/resolve_age_key/install_age_key with IdentitySource/resolve_identities. Update integration tests to use a valid age bech32 key fixture. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>