Interactive secret creation fails to persist (doppler secrets set without value)

When using the interactive mode of doppler secrets set, the CLI accepts input from stdin but fails to create/persist the secret.

Environment

• Doppler CLI: v3.75.3
• OS: macOS

Steps to Reproduce

1. Run: doppler secrets set SECRET_NAME
2. Enter a value at the interactive prompt
3. Press Enter to submit
4. Expected: Secret is created in Doppler
5. Actual: Secret is not created (no error message)

Expected Behavior

The secret should be created and persisted in Doppler after providing a value interactively.

Additional Context

The help text shows that interactive stdin is a supported method:

doppler secrets set CERT
multiline
value
.

But it appears to fail in practice. The --no-interactive flag exists to disable interactive mode, but there's no explicit --interactive flag to enable it (it should be implicit when no value is provided).

Start by tracing the doppler secrets set SECRET_NAME command and its interactive stdin path in the Go CLI. Reproduce the behavior with no value argument, then verify that entering a value and pressing Enter persists the secret without --no-interactive.