Add Unit Tests for Core Components

[ananos]

The framework currently lacks coverage tests for its modules (e.g., agents, cli, NB API). Adding unit tests helps catch regressions and makes refactoring safer.

Details

We should:

• Pick 1-2 small components (e.g., a helper function or service client).
• Write pytest-based tests (happy-path and edge cases).
• Add coverage threshold checks to CI (e.g., minimum 70–80%).

This work boosts confidence in the framework and lowers entry barriers.