fix(report): clarify scan output and package versions - #1614

PR Summary

Medium Risk
Changes default CLI report output and renames a Markdown table column, which may break consumers parsing Introduced by; behavior of JSON output is unchanged.

Overview
Replaces default socket scan report terminal output with a formatted plain-text report (health summary, settings, aligned alert table with URLs on separate lines) instead of dumping nested Map structures via logger.dir.

Markdown reports now label the third alert column Version (was Introduced by) and URL (was url), backed by shared flattenReportAlerts / table-formatting helpers used by both Markdown and text output. JSON report shape is unchanged.

Adds broad Vitest coverage for plain text rendering (Unicode, column alignment, empty alerts, fold modes, large reports) and updates existing Markdown snapshots.

^{Reviewed by Cursor Bugbot for commit a164eb5. Configure here.}