Plugin proposal: al-repo-insights (from PR #3438)

[alshedivat]

Source PR: #3438

This feature does not currently map cleanly to an existing owning plugin.
Under v1 modularization, route this work as a standalone plugin proposal.

Proposal tasks:

• confirm plugin scope and naming for al-repo-insights
• define runtime/test ownership boundaries
• implement in dedicated plugin repo
• submit follow-up PR to al-folio only for featuring/bundling metadata if approved

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.