Provide optional human-readable summary even in JSON mode #504
Description
When using JSON mode, users may still appreciate a compact human-readable summary (on stdout or stderr), e.g. “3 slots changed between block A and B (address …)”.
Why:
- For interactive use it’s helpful to get a quick glance rather than parse full JSON.
- Improves UX in scripts / CI — you see a summary in logs without extra JSON parsing.
Suggested changes:
In JSON mode when batch mode is used (or when number of slots > 1), after printing JSON add a short summary line.
Optionally, add a --quiet or --no-summary flag to suppress.