010 T5: Python discovery-reconciliation guard nf-essa ← Beads

Twinned from https://github.com/cfsh/ninefold/issues/1005 by tools/beads/import_github.py's reconcile pass.

From 010-co-located-tests-and-probes.md's task table (design 010). - Note: files-on-disk vs modules-loaded, fail on mismatch; __init__.py audit