laslig v0.2.0

Highlights

• add Printer.NewSpinner with Start, Update, and Stop for long-running CLI work
• animate one transient progress line on styled human terminals while keeping plain, unstyled human, and JSON output stable
• add focused spinner docs, examples, goldens, and VHS captures, and fold spinner into the paced mage demo walkthrough

Notes

• Spinner is explicit and opt-in; callers still own command execution, cancellation, timing thresholds, and final success or failure reporting
• use Spinner when a command may otherwise stay quiet for several seconds; prefer StatusLine or Notice for short-lived work
• existing callers do not need any source changes unless they want to adopt the new helper