## Summary Set up a test infrastructure using Plenary/Busted with a MockProvider for unit testing. ## Context No tests exist currently. The 99 plugin has 8 test files with a MockProvider for testing without actual CLI calls. ## Acceptance Criteria - [ ] Plenary/Busted test setup - [ ] MockProvider that simulates Claude CLI responses - [ ] Tests for core modules (TextStreamBuffer, Range/Point, Mark, etc.)
Summary
Set up a test infrastructure using Plenary/Busted with a MockProvider for unit testing.
Context
No tests exist currently. The 99 plugin has 8 test files with a MockProvider for testing without actual CLI calls.
Acceptance Criteria