molecule create should know when to auto-recreate

Molecule should be able to recreate a platform when configuration was changed. Current behavior is to re-use the already created platforms even if the molecule.yml or the Dockerfile was modified.

The logic does not have to be perfect for triggering recreation but it should clearly be able to detect that molecule.yml file was updated.

Start by tracing the create workflow that reuses already-created platforms, then inspect how molecule.yml and Dockerfile changes are surfaced. Done means a changed molecule.yml clearly triggers platform recreation, with Dockerfile changes considered if supported by the existing workflow.

Written by the indexing model from the issue text.