Verify all modules in the repo run with the current observe-sdk and using the new namespace

Ideally still store old namespace modules in repo in a special test data directory for testing for backwards compatibility, but out of the way for new observe-sdk users.

No files or tests are named. Start by inventorying the repository's modules and how they use the current observe-sdk namespace, then identify where compatibility fixtures can live. Done means all current modules run with the new namespace and old-namespace modules remain available as isolated test data for backwards-compatibility checks.

Written by the indexing model from the issue text.