The first-run calibration prompt (profile onboarding step 3) and the
Progress-screen calibration card both told the user to play the
"Slopsmith Diagnostic". Update the visible copy to "fee[dB]ack
Diagnostic". Text-only; the diagnostic is matched functionally by the
is_diagnostic flag + filename, not by this label, so no behavior change.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Signed-off-by: topkoa <topkoa@gmail.com>
