v0.5.1

Fixed

• macOS: the keychain prompts are gone. The conduit-gateway helper that your
  AI clients launch now reads your vaulted secrets (API keys, OAuth/bearer tokens)
  with no keychain password prompt. Newly saved secrets get this automatically;
  existing ones are upgraded on first launch. (Done with a trusted-application ACL
  granting both the app and the gateway access, since the modern entitlement
  approach can't work for a standalone helper binary.) Thanks @bradhallett for
  tracing the root cause.