Anto01 58c744fd2f feat: post-backup validation + retention cleanup (Tasks B & C) ...

- create_runtime_backup() now auto-validates its output and includes
  validated/validation_errors fields in returned metadata
- New cleanup_old_backups() with retention policy: 7 daily, 4 weekly
  (Sundays), 6 monthly (1st of month), dry-run by default
- CLI `cleanup` subcommand added to backup module
- 9 new tests (2 validation + 7 retention), 259 total passing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-04-11 09:46:46 -04:00

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