c29d581fb1
Move runner.go, runner_windows.go, runner_other.go, runner_test.go from src/core to src/runner (package runner). Split helpers into focused files: invocation*.go, exitcodes.go, logfile.go, cleanup.go. Export LogArguments and SuccessExitCodesText for use by scheduler's runningOutput helper. Update src/core/scheduler.go and src/gui/app.go to import src/runner. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>