Implemented mandatory and recommended fixes from code review:
1. Fix timer cleanup in cliSpinner.test.ts
- Added vi.useRealTimers() to afterEach hook
- Prevents fake timers from bleeding into other test files
2. Fix isCancel mock in initAction.test.ts (3 locations)
- Changed from mockReturnValue(true) to mockImplementation
- Now properly tests only the actual cancel symbol
- More accurate test behavior for cancellation scenarios
3. Add DI pattern explanation comment in configLoad.ts
- Clarifies why dependency injection is used for jitiImport
- Documents the double instrumentation issue
- Helps future maintainers understand the design decision