Is there console.log output support to terminal/command-line with intern-runner?
How console.log works with intern-runner depends on where your test code is running. Unit tests (specified with suites) run in the browser, so that's where console.log output ends up. There isn't currently a way to get console output out of a browser for unit tests.
Functional tests (specified with functionalSuites) control a browser, but actually run in Node.js, so output from console.log statements in functional tests generally goes to intern's stdout. The exceptions are log statements in execute and executeAsync blocks; since those blocks run in the browser, that's where the log output ends up. You can retrieve browser logs in functional tests using getLogsFor('browser'), but WebDriver log support is inconsistent between browsers.