New artisan command brain:prune {--older-than=90} {--chunk=100} {--dry-run}
that completes the soft-delete → hard-delete lifecycle by:
1. selecting BrainMemory::onlyTrashed() where deleted_at < now - N days
2. dispatching DeleteFromIndex for each (Qdrant + ES cleanup)
3. forceDelete()'ing the rows
--dry-run counts without dispatching.
Complements brain:clean (which cleans recent soft-deletes) with a
retention-bounded terminal cleanup.
Pest coverage: Good (dispatch + forceDelete on aged trashed rows), Bad
(invalid chunk), Ugly (--dry-run skips both dispatch and delete).
Co-authored-by: Codex <noreply@openai.com>
Closes tasks.lthn.sh/view.php?id=62
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